A website rarely becomes known for a subject because of one good article.
Think about a website that publishes one detailed guide about running shoes, but everything else on the site is about unrelated subjects. Now compare it with a website that has useful guides about running shoes, trail shoes, running injuries, training, race preparation, and choosing footwear for different types of runners.
It is much easier to understand what the second website knows about.
In SEO, this idea is often described as topical authority. It refers to becoming a recognized source of useful information around a particular subject rather than publishing one isolated page about it.
So where do backlinks fit into this?
Backlinks are links from other websites to yours. When relevant pages on your site earn links from other websites, those links become external connections to the content you have built around the subject.
That does not mean there is a public Google “topical authority score” that increases every time you receive a backlink. The relationship is more useful to understand by looking at what happens across the pages of a website.
First, There Has to Be a Topic to Build Around
Return to the running website.
It might have one broad guide explaining how to choose running shoes. Another page could cover trail running shoes, while others discuss shoe cushioning, running surfaces, or replacing worn shoes.
These pages do not need to repeat the same information. They cover different parts of a larger subject.
When related pages are connected with useful internal links, readers can move from one part of the subject to another. Search engines can also use links to discover pages and understand relationships between them.
People in SEO often call a group of closely related pages a topic cluster.
The important idea is simpler than the terminology: instead of publishing one page and stopping, the website develops useful coverage around the subject.
What Changes When Other Websites Start Linking to Those Pages?
Now another running website publishes an article about choosing shoes for a first marathon and links to your guide about running shoe cushioning.
Later, a sports publication links to your trail running shoe guide while discussing different running surfaces.
Another website references your guide about knowing when running shoes need to be replaced.
Instead of every external link pointing to one page, different pages within the same broad subject are being referenced from elsewhere on the web.
Google documents that its ranking systems include link analysis systems, including PageRank, that examine how pages link to one another. What Google does not provide is a formula telling us that a certain number of backlinks across a topic cluster creates a particular level of topical authority.
The useful observation is that the website is no longer only publishing information about running shoes. Some of that information is also being independently referenced from outside the website.
Does Every Backlink Help With the Topic in the Same Way?
No.
Consider a backlink to the running shoe guide from an article discussing how different shoes affect a runner on long-distance routes. The relationship between the discussion and the destination is easy to understand.
Now consider a link to the same guide placed without explanation on a page about accounting software.
Both are technically backlinks, but their surrounding situations are very different.
This is why relevance matters when thinking about backlinks and subjects. A link from a related discussion gives us a much clearer connection between the linking page and the destination than a link appearing in an unrelated conversation.
That does not mean Google publishes a rule saying that a topically relevant backlink receives a particular amount of additional ranking value. It means we should not treat every backlink as though its surrounding context were identical.
You can also check out this video for additional insight
What If Only One Page Gets All the Backlinks?
This creates another useful distinction.
Suppose the running website has 30 articles, but nearly every backlink points to one popular guide about choosing running shoes.
That page may have attracted considerable outside attention, but the backlinks alone do not tell us that the other 29 pages have received the same recognition.
Now consider a different situation. The shoe guide receives backlinks, but so do the pages about trail running, cushioning, shoe replacement, and running surfaces.
The external references are now reaching several parts of the site’s coverage.
Internal links can connect those related pages and help users and search engines move between them. However, we should be careful not to turn this into a simple claim that authority from one backlink automatically spreads equally throughout an entire topic cluster.
If you want to understand that part more closely, it helps to look separately at how link equity can be distributed.
Does a Backlink From a Famous Website Automatically Build Topical Authority?
Not necessarily.
A well-known website can cover thousands of subjects. Its size or reputation does not automatically make every page on it closely related to your subject.
For example, a large news publication could have an article specifically about marathon training that naturally references a running resource. A smaller specialist running website could also publish a relevant article and link to the same resource.
Rather than looking only at the name of the website, it helps to examine the actual page, the discussion surrounding the link, and the destination.
This is the same reason website authority and the value of an individual backlink should not be treated as exactly the same thing.
Can Backlinks Create Topical Authority Without Strong Content?
This is where the idea reaches its limit.
If a website has only one thin page about running shoes, collecting backlinks does not magically give it deep coverage of running.
The information still has to exist.
Useful pages can cover different parts of a subject, and internal links can help connect those pages where the connections make sense. Backlinks can then point from other websites into that body of content.
This gives us a much simpler way to understand how backlinks build topical authority.
The website develops useful knowledge around a subject first. Backlinks do not create that knowledge. They provide external connections to the pages where that knowledge already exists.