What Is a Link? A Complete Guide to Hyperlinks in SEO

A link, short for hyperlink, is a clickable element on a webpage, whether it is text, an image, or a button, that takes a user from one location to another with a single click. Links are the basic connective tissue of the web, and they carry just as much weight for search engines as they do for the people clicking them.

This guide covers what a link actually is at the HTML level, the different types of links you will encounter, and why this simple mechanism became one of the most important ranking signals in SEO.

Link Definition in Simple Terms

At its core, a link is an instruction inside a webpage’s HTML that tells a browser where to go when a user clicks on it. The link is built using an anchor tag, written as <a>, and the destination is stored inside an href attribute, which stands for hypertext reference. A basic link looks like this in raw code: <a href="https://example.com">visit this page</a>.

The word anchor is not accidental. Early hypertext documents often linked to specific anchors, or markers, within a page rather than to entire separate documents, and the terminology stuck even as the web grew far beyond that original use case.

A link does not have to be text. When a link tag wraps around an image tag instead of a word or phrase, the entire image becomes clickable, and clicking anywhere on it sends the user to the destination in the href attribute. Buttons work the same way behind the scenes, styled to look like a button but functioning as a standard link underneath.

Links are not limited to the web browser either, even though that is where most people encounter the term. In broader computing and communications, a link can describe a physical or logical connection between two devices, such as the link your computer establishes with a router when you connect to the internet. In programming, linking refers to a step a compiler performs to combine separate pieces of code into a single executable program. Even in a spreadsheet, linking one worksheet to another lets data flow between them automatically. The web’s hyperlink borrowed the general idea of a connection between two things and applied it specifically to navigating between documents, which is why the same word covers such a wide range of technical meanings depending on context.

How Links Work: Anchor Text and the Anchor Tag

The visible, clickable portion of a text link is called anchor text. It is usually styled in a different color from the surrounding content, historically blue and underlined, though modern web design has moved well past that original convention while keeping some visual distinction intact so readers can spot a link at a glance.

Anchor text matters for more than just visual style. It gives both human readers and search engine crawlers context about what they will find if they click. A link with the anchor text “best dog food for picky eaters” tells a reader and a search engine far more about the destination page than a generic anchor like “click here” ever could.

Links also come in two structural forms depending on how the destination is written. An absolute link includes the full domain name, such as https://example.com/page, and is required whenever a link points to a different website. A relative link omits the domain and points to a location within the same site, such as /page, relying on the browser to fill in the current domain automatically. Absolute links may also begin with two forward slashes instead of a full protocol, which browsers interpret as https for pages served securely.

This distinction is more than a technical curiosity for anyone maintaining a website. Relative links are generally preferred for internal navigation because they keep working correctly even if a site migrates to a new domain or switches between staging and live environments, while a hardcoded absolute link to your own domain would need updating in every one of those scenarios. External links, by contrast, must always be absolute, since there is no way for a browser to infer a completely different domain from a relative path.

Types of Links: Internal, Inbound, and Outbound

Not every link serves the same purpose, and search engines classify links based on where they point relative to the site they appear on.

Internal links connect pages within the same website. Search engines identify these by checking whether the link’s domain matches the domain of the page it appears on. Internal links show up in a few predictable places: standard site navigation menus that appear across every page, related content sections that point readers toward similar topics, and in-content links placed naturally within a paragraph to connect one page to another relevant one. A well-structured internal linking setup, the kind covered during custom website design and development, helps both users and search engine crawlers move through a site efficiently, discovering pages that might otherwise sit buried several clicks deep.

Inbound links, also called backlinks, are links coming from a different website into yours. These carry the most SEO weight of the three types because each one functions as a kind of vote of confidence from another site. When another website links to yours, it is signaling to search engines that your content has something worth pointing readers toward, whether that is because the linking site agrees with your content or simply finds it useful enough to cite.

Outbound links are links on your own site that point out to a different domain entirely. These deserve thoughtful use rather than avoidance. Linking out to genuinely relevant, high quality sources when it helps the reader is normal editorial behavior that search engines expect to see, and it can actually reinforce that your own content is well-researched and trustworthy.

There was a period in SEO history when site owners worried that every outbound link leaked away a measurable amount of ranking power, a concept sometimes called PageRank hoarding. Some practitioners responded by refusing to link out at all, or by nofollowing every single external link on a page regardless of quality. Google addressed this directly with an update addressing what it called PageRank evaporation, making clear that hoarding link equity by refusing to link out does not actually work the way early SEOs assumed. A page with zero outbound links does not look more authoritative to a search engine; it often looks isolated and thin. The more durable approach, and the one that search engines have consistently rewarded, is linking out naturally wherever it genuinely serves the reader, since good quality sites tend to link to other good quality sites as a simple byproduct of writing well-researched content.

Dofollow vs Nofollow Links

Every link defaults to what the industry casually calls dofollow, meaning it passes the full weight of whatever ranking signals the linking page carries. No special attribute is needed for a link to behave this way. It is simply the standard state of a hyperlink unless something changes it.

A nofollow link is different. It carries a rel="nofollow" attribute inside its HTML, which asks search engines not to pass ranking credit through to the destination. Google introduced the attribute in 2005 to help combat comment spam, and in 2019 it added two related attributes, rel="sponsored" for paid placements and rel="ugc" for user generated content such as comments and forum posts. Since March 2020, Google treats all three as hints rather than absolute rules, meaning it can, in some cases, choose to weigh these links anyway.

This distinction matters most when you are managing outbound links on your own site or evaluating the backlinks pointing toward it. Checking which type a link falls into takes only a few seconds. Right click any link on a page, choose Inspect, and look at the anchor tag for a rel attribute. No rel attribute at all, or one that does not include nofollow, sponsored, or ugc, means the link is a standard, fully weighted link.

Knowing which is which matters most in two everyday situations. If you are managing your own site’s outbound links, deciding when to qualify a link with one of these attributes protects you from Google’s link spam policies whenever money or a paid arrangement is involved. If you are evaluating a backlink profile pointing toward your own site, understanding the split helps you interpret why a healthy profile is rarely one hundred percent dofollow, since forums, review sites, and social platforms qualify their outbound links automatically as a matter of course. For a full breakdown of how nofollow links function in 2026 and whether they genuinely help SEO, see our companion guide on do nofollow links help SEO.

Why Links Matter for SEO: A Short History of PageRank

To understand why links became so central to SEO, it helps to look at where the practice started. In the earliest days of search, before Google existed, ranking was based almost entirely on keyword usage within a page’s content. The logic seemed reasonable at the time: the more a phrase appeared on a page, the more likely that page was actually about that topic. Predictably, this system got abused quickly through keyword stuffing, where pages crammed in a target phrase far beyond what any reader would find useful, just to rank higher.

Google, founded in 1996 by Larry Page and Sergey Brin, took a fundamentally different approach with its original ranking algorithm, PageRank, developed by Page while studying at Stanford. Instead of relying purely on the words within a page, PageRank counted the number and quality of links pointing to a page from other pages across the web, treating each link roughly as a vote. The underlying assumption was straightforward: pages that other people found valuable enough to link to were more likely to actually be valuable, regardless of how many times they repeated a given keyword.

This shift changed SEO permanently. A link from a page became a signal of trust, credibility, and authority, and the more high quality links a page accumulated, the more that trust compounded. Naturally, this also created a new incentive to game the system, this time through artificial links planted in blog comments, forum signatures, guestbooks, and directories built purely to manufacture the appearance of endorsement rather than to genuinely help anyone.

Google’s Penguin update, which became part of the core ranking algorithm, was built specifically to identify and discount these artificial link patterns. After Penguin, the emphasis shifted firmly toward earning natural links through genuinely useful, link-worthy content rather than manufacturing links through spammy tactics. This is part of why an ongoing content and technical strategy, the kind covered under SEO services, tends to outperform one-off link building pushes over the long run. Natural links from quality content compound the same way PageRank originally intended, just without the shortcuts that Penguin was built to catch.

Anchor text diversity became part of this same conversation. Historically, some SEOs abused anchor text by using the exact same keyword-rich phrase across thousands of inbound links, a tactic sometimes called link bombing. Google’s updates addressed this directly, and today a natural link profile shows a healthy mix of branded anchor text, generic phrases like “click here” or “learn more,” and only a reasonable share of exact-match keyword anchors.

How Internal Links Distribute Authority Across a Site

Inbound links are the most beneficial link type for SEO, but they are also the hardest to earn, since they depend on other websites choosing to link to you. Internal links solve a different but related problem: once a site has earned authority through inbound links, usually concentrated most heavily on the homepage, internal links are what carry that authority through to every other page.

In most websites, the homepage accumulates the largest number of inbound links simply because it is the page other sites most commonly reference. When that homepage links out to other pages within the same site, some portion of its accumulated authority flows along with the link. This is why a page that sits many clicks away from the homepage, reachable only through a long chain of internal links, tends to rank more poorly than an equally strong page that a visitor can reach in a single click from the homepage or a prominent navigation menu.

This is also why internal linking should never be treated as a purely mechanical SEO exercise separate from the reader’s actual experience. The clearest and most sustainable internal linking strategy links naturally within the body of an article whenever a mention genuinely relates to another page on the site, supplemented by clear navigation menus and a related-content section rather than by forcing keyword-stuffed links into places a reader would find unnatural. A site with an intentional internal linking structure helps search engine crawlers map the relationship between pages efficiently, while a site with no clear internal linking pattern can leave valuable pages essentially invisible, discovered by neither readers nor crawlers no matter how strong the content on them actually is.

Jump Links and Other Link Types You Might Encounter

Not every link takes you to a different page entirely. Jump links, also called anchor links, are hyperlinks that scroll a reader down to a specific section within the same page rather than loading a new document. These are especially useful on long-form pages, letting a reader click a table of contents entry and land directly on the relevant section instead of scrolling manually.

Breadcrumb links are another common variant, typically appearing near the top of a page to show a reader their location within a site’s structure, such as Home, then Blog, then the specific article. Standard navigational menu links, the kind found in a header or footer, round out the common link types most visitors interact with without ever thinking about the underlying mechanism.

Sitemaps deserve a mention here too, since they function as a single page built almost entirely out of links, pointing to every other page on a site, or at minimum every main category. Usability research on how visitors navigate a website has generally identified three distinct patterns: people who rely on standard navigation menus, people who go straight to a search box, and a smaller group who head directly to a sitemap page when they cannot find what they need any other way. For very large websites, a full sitemap listing every single page can become overwhelming for a human visitor, so many sites limit their visible sitemap to main categories while still submitting a complete, separate XML sitemap for search engines to crawl.

Frequently Asked Questions

What is the difference between a link and a hyperlink?

There is no real difference. Link is simply the shortened, everyday term for hyperlink. Both refer to the same clickable element that takes a user from one location to another on the web.

What is anchor text?

Anchor text is the visible, clickable text of a hyperlink. It typically appears in a different color from surrounding text and gives both readers and search engines context about what the linked page is about.

What is a nofollow link?

A nofollow link carries a rel nofollow attribute in its HTML, which asks search engines not to pass ranking credit to the linked page. Since 2020, Google treats this as a hint rather than a strict rule.

What is the difference between internal and external links?

An internal link connects two pages on the same domain, while an external link points to a page on a different domain entirely. Internal links help with site navigation and distributing authority across your own pages, while external links either send authority out or bring it in depending on the direction.

Why are links important for SEO?

Links let search engines discover new pages, help determine how much authority and trust a page deserves, and give context about what a page is about through anchor text. Google’s original ranking algorithm, PageRank, was built almost entirely around counting and weighing links.

What is a broken link and why does it matter?

A broken link is a hyperlink pointing to a destination that no longer exists or has moved, typically resulting in a 404 error page when clicked. Broken links frustrate readers and waste the crawl budget search engines allocate to a site, which is why periodic link audits, checking both internal links and outbound links to external sites, are a standard part of ongoing website maintenance.

Can a link exist without anchor text?

Yes. A link applied to an image rather than text has no anchor text in the traditional sense, though the image’s alt attribute often serves a similar descriptive purpose for both accessibility tools and search engines. A link can also technically point nowhere useful, such as an empty href value used as a placeholder during development, though this should always be corrected before a page goes live.

How to Check and Audit Links on a Website

Beyond understanding what a link is, most site owners eventually need to check the actual links on their own pages, whether to find broken ones, verify anchor text, or confirm which rel attributes are in use. The simplest manual method is right clicking any link and selecting Inspect, which opens the browser’s developer tools and shows the exact anchor tag, including its href destination and any rel attribute attached to it.

For a full site rather than a single page, dedicated crawling tools such as Screaming Frog, Ahrefs, or Semrush can scan every page at once, exporting a complete list of internal links, external links, anchor text, and rel attributes in a single report. This kind of audit typically surfaces a handful of common issues on most sites: broken internal links pointing to pages that were moved or deleted, orphaned pages with no internal links pointing to them at all, and outbound links to external pages that have since gone offline. Catching these issues early keeps both readers and search engine crawlers moving smoothly through a site rather than hitting dead ends.

Conclusion

A link is simple at its core, a clickable element that connects one piece of content to another, yet this simple mechanism became the foundation of how modern search engines evaluate trust, authority, and relevance across the entire web. Understanding the different link types, how anchor text works, and why Google built an entire ranking philosophy around links makes it much easier to build a website that both readers and search engines can navigate well.

If your site’s internal linking, navigation, or overall structure needs a closer look, our web design services team can help you build a site that puts these principles to work from the ground up.