The word “link” covers two useful but distinct SEO concepts. An internal link points from one page on your website to another page on the same website. A backlink, also called an external inbound link, points from another website to yours. A link from your article to your services page is internal; a link from a publisher’s article to that same services page is a backlink.
The difference matters because the owner controls the first link but usually does not control the second. Internal links are mainly a tool for navigation, discovery, context, and site architecture. Backlinks can introduce your pages to audiences and crawlers outside your site and can serve as independent references. Neither type guarantees rankings, and a high link count is not a substitute for useful content or sound technical work.
What each link type does
Internal links create a map inside your site
Internal links help visitors move from a broad page to a more specific one, or from an explanation to the next practical step. They also give search engines a crawl path through pages that are already known. A normal HTML anchor with a real href is the dependable foundation; links that work only through an interface event are less clear to crawlers.
Placement and wording add context. A sentence such as “learn what Domain Rating measures before comparing tools” tells a reader why the destination is relevant. “Click here” does not. Use concise anchor text that accurately describes the destination without forcing keywords.
Backlinks connect your site to other sites
A backlink is an editorial or navigational reference from an external site to a page on your site. It can send referral visitors, help crawlers discover a URL, and provide evidence that another publisher found the page worth mentioning. Its usefulness depends on the source page, the surrounding topic, the destination, and the reason the link exists. A relevant citation in a real article is a different signal from a mass of unrelated directory or automated links.
Backlinks are also the kind of links represented by third-party metrics such as Domain Rating. To understand the limits of that metric, read Domain Rating vs. Domain Authority. These scores can help with comparison and research, but they are not Google rankings and should not be treated as proof that a page is trustworthy or useful.
How crawl paths differ
Internal links form the routes a crawler can follow within your information architecture. A new guide linked from a relevant, indexable article has a clear route from a known page. A page with no meaningful internal links may be difficult for users to reach and easy to overlook during crawling, even if it appears in an XML sitemap. Google recommends ensuring that every important page is linked from another page and that links use crawlable anchor elements.
Backlinks provide routes from outside your site. A crawler may discover your page through a link on a publication, partner site, community resource, or other web property. You cannot build a sensible crawl plan by relying on backlinks alone: external links are unpredictable, may disappear, and may point to the wrong version of a URL. Use internal links to make important pages reachable regardless of how many external references they have.
How links provide page context
Internal links let you explain relationships deliberately. A parent guide can link to supporting articles, and those articles can link back to the guide when it genuinely helps. Related links can clarify terminology, show a process, and direct attention to pages that deserve a place in the site’s structure. For example, a page about link evaluation can point readers to what a backlink is and to a practical backlink audit guide.
External links provide a different kind of context: an outside source can support a statement, add detail, or give readers a way to verify information. Linking to an authoritative source is not inherently harmful. Google’s guidance says ordinary editorial links do not need a special attribute. Paid placements should use rel="sponsored", and user-generated links can use rel="ugc"; use nofollow when you do not want to endorse or pass signals through a link.
Build a sensible internal architecture
Start with the user’s route, not a target number of links. Put broad, durable topics near the top of the hierarchy. Link them to focused pages that answer narrower questions. A service site might connect its home page to service categories, then to individual services and supporting guidance. A publisher might connect a topic overview to definitions, comparisons, and step-by-step articles.
Use navigation for primary destinations and contextual links for relationships that need explanation. Add links when a reader would reasonably want the next page. Keep important pages reachable through plain HTML links, avoid orphan pages, and check that links do not lead through unnecessary redirects or broken URLs. A related-content area can help, but it should supplement useful body links rather than replace them.
Do not create a rigid silo that prevents helpful connections between related subjects. A clean folder structure can support understanding, but topical relationships often cross folder boundaries. For example, an article on improving Domain Rating sustainably may reasonably link to content about referring domains, audits, and content quality. The link should exist because the reader needs that connection, not because a diagram demands another arrow.
A practical workflow for site owners
First, list the pages that matter to visitors and business goals. Next, check whether each one has a clear internal route from a page that users and crawlers can reach. Add or revise links where the surrounding text can explain the destination. Then review external opportunities separately: create genuinely useful resources, maintain relationships with relevant publishers, and promote work that deserves independent citation. Do not buy or automate links simply to increase a metric.
During an audit, inspect the source and destination rather than counting links in isolation. For internal links, look for orphan pages, vague anchors, links to redirects, and sections that receive no useful navigation. For backlinks, review relevance, placement, destination, and whether the link is paid or user-generated. If you want a quick metric benchmark, you can check a domain, then inspect the actual pages behind the number.
The bottom line
Internal links make your site understandable and reachable from within. Backlinks give pages independent connections from elsewhere on the web. Use internal links to design crawl paths, express page relationships, and guide readers through a coherent architecture. Earn backlinks by publishing material that other sites can cite or recommend. When the two systems support each other, visitors get clearer paths and search engines get better evidence about how your pages fit together.