An internal link is a hyperlink that connects one page on your website to another page on the same website. When a visitor clicks an internal link, they stay within your domain — navigating from one piece of your content to another.

In HTML, an internal link looks like this:

<a href="/your-page-url">Anchor Text</a>

Or with the full domain included:

<a href="https://yourwebsite.com/your-page-url">Anchor Text</a>

Internal links are entirely within your control. You decide which pages link to which other pages, what anchor text to use, and how many internal links each page contains. This control makes internal linking one of the highest-return, lowest-risk SEO improvements available to any website.

Common types of internal links include:

  • Navigation links — links in your website's main menu, header, or footer that connect to primary pages
  • Contextual links — links embedded within the body content of a page that connect to related content
  • Breadcrumb links — hierarchical navigation links that show a user's location within your site structure
  • Related content links — links at the bottom of articles suggesting further reading
  • Sidebar links — links in a sidebar widget pointing to popular or recent content
  • Call-to-action links — links within buttons or CTAs directing users to specific pages

An external link is a hyperlink that connects a page on one website to a page on a different website. External links come in two forms depending on direction: outbound links and inbound links (backlinks).

Outbound links are links on your website that point to pages on other websites. When you reference a source, cite a statistic, or recommend a resource by linking to an external website, you are creating an outbound link.

Inbound links — commonly called backlinks — are links on other websites that point to your website. These are the links that SEO practitioners spend significant effort acquiring because they are a primary ranking signal in Google's algorithm.

In HTML, an external link looks identical to an internal link — the difference is simply that the destination URL belongs to a different domain:

<a href="https://another-website.com/page">Anchor Text</a>

Internal links influence SEO in three primary ways: link equity distribution, crawlability, and topical relevance signaling.

Every page on your website that has accumulated backlinks from external sources holds a reservoir of link equity — ranking authority passed from those external links. Internal links are the mechanism through which that equity flows to other pages on your site.

A page with many strong external backlinks — your homepage, for example, or a highly linked blog post — can pass a portion of its authority to other pages through internal links. This is why internal linking is so strategically important: it allows you to direct authority from your strongest pages toward the pages you most want to rank — whether product pages, service pages, or specific content pieces targeting competitive keywords.

Crawlability and Indexation

Search engine crawlers discover pages by following links. A page that has no internal links pointing to it — an orphan page — may not be discovered or crawled consistently, regardless of how good its content is. A well-structured internal linking system ensures that every important page on your website is reachable from other pages, making it easy for crawlers to find, index, and evaluate your content.

Topical Relevance and Context

The anchor text of internal links provides search engines with contextual information about the destination page's content. When you link to a page about "backlink building strategies" using that phrase as anchor text, you are reinforcing that page's topical relevance for those terms. Consistent, descriptive internal link anchor text across your website strengthens the topical signals for your most important pages.

External backlinks are one of Google's most important ranking signals — a fact consistently supported by correlation studies, real-world testing, and Google's own documentation. They function as third-party endorsements: when an independent website links to yours, it signals to search engines that your content is valuable, trustworthy, and worth referencing.

Authority and Trust Signals

Backlinks from high-authority, reputable websites transfer link equity to your pages and contribute to your overall domain authority. The more high-quality external links pointing to your website, the stronger the trust and authority signals your domain sends to search engines — which directly influences your ability to rank competitively across a wide range of keywords.

Topical Authority

Links from websites covering topics related to yours send strong topical relevance signals. A backlink from a leading publication in your industry tells Google not just that your site is trusted, but that it is trusted specifically within that topic area — which strengthens your rankings for topic-relevant searches.

Discovery and Indexation

External backlinks from frequently crawled, high-authority websites help Google discover your content faster. A new page on your website that receives a backlink from a high-DR website is likely to be crawled and indexed significantly faster than a page with no external links pointing to it.

Outbound links — the external links you place on your own website pointing to other domains — influence SEO in ways that are frequently misunderstood.

Outbound links do not automatically hurt your rankings. A common misconception is that linking to external websites "leaks" link juice and harms your SEO. In reality, linking to high-quality, relevant external sources is a positive signal — it indicates that your content is well-researched and connected to the broader information ecosystem around your topic.

Outbound links to authoritative sources improve content quality signals. Pages that cite and link to credible, relevant external sources tend to perform better in search results than pages that exist in isolation. Google's quality raters specifically look for evidence that content is well-sourced and connected to authoritative references.

Excessive outbound links dilute equity. While linking to relevant external sources is beneficial, pages with an excessive number of outbound links — particularly to unrelated or low-quality destinations — can dilute the equity available to your internal links and signal low-quality content to search engines.

Outbound link attributes matter. Use rel="nofollow" for links to untrusted sources, rel="sponsored" for paid or affiliate links, and standard DoFollow links for genuine editorial references to quality sources.

Internal Links External Backlinks
Definition Links between pages on the same domain Links from other domains pointing to your site
Control Fully within your control Controlled by the linking website
Primary SEO function Distributes existing authority, aids crawlability Builds domain authority and trust signals
Difficulty to acquire Easy — you create them yourself Requires outreach, content quality, or relationship building
Link equity source Redistributes equity already present on your site Introduces new equity from external sources
Impact on rankings Significant — particularly for deep pages Very significant — one of the top ranking factors
Risk Low — fully controllable Higher — toxic backlinks can cause penalties

Internal Linking Best Practices

Use descriptive anchor text. Always use anchor text that accurately describes the content of the destination page. Descriptive anchors like "how to build backlinks for a new website" are more valuable than generic phrases like "click here" or "read more" — both for user experience and for the topical relevance signal they send to search engines.

Link from high-authority pages to important target pages. Identify the pages on your website that have accumulated the most external backlinks — your highest-authority pages — and ensure they include internal links to the pages you most want to rank. This channels your strongest equity sources toward your most important ranking targets.

Eliminate orphan pages. Every important page on your website should have at least one internal link pointing to it. Use Google Search Console or a crawler tool like Screaming Frog to identify orphan pages and add relevant internal links from appropriate existing content.

Avoid over-linking. Including too many internal links on a single page dilutes the equity passed to each destination and can overwhelm users. Include internal links where they genuinely add value — linking to relevant related content, supporting claims with further reading, or guiding users naturally through your content.

Fix broken internal links promptly. Broken internal links waste the equity of the linking page and create a poor user experience. Conduct regular audits using Google Search Console or Screaming Frog to identify and fix broken internal links across your website.

Maintain a logical site architecture. Every important page should be reachable within three clicks from your homepage. A flat, logical site structure ensures link equity flows efficiently throughout your website rather than being trapped in deep, hard-to-reach pages.

Prioritize quality over quantity. One high-quality backlink from a relevant, authoritative website is worth more than dozens of links from low-quality sources. Focus your link building efforts on acquiring links that would genuinely impress a knowledgeable human reviewer — not just accumulating volume.

Focus on topical relevance. Links from websites covering topics related to yours carry more SEO value than links from unrelated sources — even if the unrelated source has higher domain authority. Always prioritize relevance alongside authority when evaluating link opportunities.

Diversify your link sources. A healthy backlink profile draws links from a wide range of independent domains — guest posts, directories, editorial mentions, backlink exchanges, digital PR, and more. Relying too heavily on any single link source creates an unnatural-looking profile and concentrates your risk.

Build links to your most important pages directly. While homepage links are valuable for overall domain authority, links to specific content pages, category pages, and product pages provide more targeted ranking support. Build links to the pages you most want to rank, not just your homepage.

Monitor and maintain your backlink profile. Regularly audit your backlinks to identify lost links, new toxic links, and acquisition opportunities. Use tools like Ahrefs, Semrush, or Google Search Console to monitor your profile continuously between formal audits.

The most effective SEO strategies treat internal and external links as complementary components of a unified system — not separate tactics.

External backlinks bring new authority into your website from the outside. Internal links distribute that authority across your website to the pages that need it most. Without strong external backlinks, there is limited authority to distribute internally. Without strong internal linking, the authority from external backlinks remains concentrated on a small number of entry points and fails to reach the pages that could benefit most from it.

A practical example: a blog post on your website earns ten strong external backlinks and accumulates significant authority. Without internal links from that post to your product pages, all that authority stays on the blog post. With well-placed internal links to relevant product and category pages, that authority flows to the pages that directly generate revenue — multiplying the impact of every external link you earn.

Building a strong, well-structured internal linking framework before aggressively pursuing external backlinks ensures that every new link you acquire delivers its maximum possible benefit to your rankings.

Key Takeaways

  • Internal links connect pages within your own website — they are fully within your control and distribute existing authority to where it is needed most
  • External backlinks come from other websites and are a primary ranking signal — they introduce new authority and trust signals from the outside
  • Outbound links — the external links you place on your own website — are beneficial when linking to high-quality relevant sources and harmful in excess or when pointing to low-quality destinations
  • Internal and external links work as a system — external links bring authority in, internal links distribute it throughout your site
  • Internal linking is one of the highest-return, lowest-risk SEO improvements available — it is fully controllable and costs nothing to implement beyond time
  • A well-structured internal linking strategy should be in place before aggressively building external backlinks — it ensures every new link earns its maximum possible ranking impact