Internal vs External Links: What Each Does for SEO
Every link on the web is either internal or external depending on where you stand. A link from your blog post to your own pricing page is internal. A link from your blog post to a government website is external, or outbound. A link from someone else's site to yours is external from their side and a backlink from yours. Three kinds of link, two words, which is why the terms get muddled.
The three link relationships
| Link | From | To | Who controls it |
|---|---|---|---|
| Internal link | Your page | Another page on your site | You |
| Outbound (external) link | Your page | Another website | You |
| Backlink (inbound external) | Another website | Your page | The other site |
Each one does a different job.
What internal links do
Help Google discover and understand pages
Googlebot follows internal links to find pages on your site. A page with no internal links pointing at it, an orphan page, may never be found unless it's in your sitemap, and even then Google may treat it as unimportant. Your XML sitemap helps (you can build one with the sitemap generator), but internal links are the stronger signal.
Spread link equity around your site
Backlinks usually land on a handful of pages. Internal links carry some of that value to the rest of the site. This is covered in detail in link equity explained.
Show what a page is about
The anchor text of internal links tells Google what the target page covers. Unlike backlinks, you can use descriptive, keyword-rich anchors here without the same risk, because Google expects site owners to label their own pages clearly. Stay readable, though. A sentence that repeats "best digital marketing agency Jaipur" three times helps nobody.
Help visitors
The real reason internal links exist. A reader of your "how to choose a wedding photographer" post probably wants to see your portfolio next.
What outbound links do
Linking to other websites doesn't directly improve your rankings, and Google hasn't said it rewards outbound links as such. But good outbound links make content more useful and credible. A post about GST registration for freelancers that links to the official GST portal is more trustworthy than one that doesn't.
A few sensible rules:
- Link to sources that genuinely support what you're saying.
- Mark paid, sponsored and affiliate links with
rel="sponsored", as covered in sponsored and UGC link attributes. - Don't worry about "leaking" link equity by linking out. It isn't a meaningful concern for normal sites.
- Check outbound links periodically, because external pages move and die. The broken link checker finds them.
What backlinks do
Backlinks are the external links you don't control directly, and they carry the most ranking weight of the three because they're a vote from outside. The rest of this blog covers them in depth; what is a backlink is the starting point.
Why internal links are the most underused
I've audited plenty of small business sites that spent money on backlinks while their own key pages were three or four clicks from the homepage with almost no internal links. That's backwards. Internal links are free, immediate and entirely under your control.
A typical example: a freelance web designer has a blog with a few posts that rank and earn links, plus a "website design packages" page that never ranks. None of the blog posts mention or link to the packages page. Adding a natural link from each relevant post, plus a prominent link from the homepage, often helps that page more than another bought backlink would.
A simple internal linking routine for small sites
- List your important pages. Services, products, categories, your best guides.
- Check how many internal links each one has. Search Console's Links report shows top internally linked pages. Many crawling tools show the same.
- Link from strong pages to important pages. Prioritise posts that have backlinks or get traffic.
- Link new posts to older related posts, and the other way round. When you publish, go back and add a link from two or three older related articles.
- Use descriptive anchors. "our wedding photography packages" rather than "click here".
- Keep important pages shallow. Aim for key pages to be reachable within about three clicks of the homepage.
Common internal linking mistakes
- Linking only through menus and footers, never from body content.
- Nofollowing internal links in an attempt to control link equity.
- Using the same exact anchor for dozens of links to one page, even where it reads awkwardly.
- Leaving internal links pointing at redirected or deleted URLs. Update them to point straight at the final page.
- Linking every post to every other post. Relevance matters more than volume.
Make it part of your routine
Pick your most important commercial page and count how many internal links point to it from body content, not menus. If it's fewer than three, find three relevant pages on your site that get traffic and add a natural link from each one today.