What Are Backlinks and Why They Matter for SEO
Basics3 minInnovialabs editorial team
In short
A backlink is a link to your site from another site, and search engines treat it as a sign of trust. A link's value comes from relevance, the source's authority and its placement — not from sheer quantity.
The short answer
A backlink is a link from someone else's website to yours. To a search engine it works like a recommendation: if other sites link to a page, it is probably useful.
Links were one of the first ranking signals and they still matter. But search engines have long learned to tell genuine recommendations from artificial ones, so "more links = higher rankings" no longer works.
How links pass authority
Every page accumulates a certain amount of trust. When it links to another page, part of that trust flows on. A few practical consequences:
- a link from an authoritative page is worth more than one from an obscure page;
- if a page has hundreds of outgoing links, each one receives less;
- links work at the page level, not only the domain level: a link to a specific article strengthens that article first;
- internal links distribute the accumulated weight across your own site.
What makes a link valuable
| Criterion | Strong link | Weak link |
|---|---|---|
| Relevance | a site and page from your topic | a random site unrelated to your niche |
| Source trust | a known publication, industry resource, partner | a site built to sell links |
| Placement | inside article text, in context | footer, sidebar, a list of a hundred links |
| Anchor text | natural: brand name, what the page is about | the same commercial phrase everywhere |
| Traffic | real people click it | nobody ever sees it |
A good mental test: would you want this link if search engines did not exist? If a link brings readers and helps the linking site's audience, it is most likely valuable for SEO too.
The nofollow, sponsored and ugc attributes
A site owner can mark a link with a special attribute:
<a href="https://example.com" rel="nofollow">...</a>
<a href="https://example.com" rel="sponsored">...</a>
<a href="https://example.com" rel="ugc">...</a>
sponsored— for paid and advertising links;ugc— for links in comments and forums;nofollow— a general "do not pass trust" signal.
Google treats these attributes as hints. Such links are still useful: they bring traffic and make the brand more visible.
Why quantity does not work
- Search engines recognise schemes. Private networks, link marketplaces, bulk directory submissions — algorithms are trained to find and discount them.
- Penalties are possible. Google and Yandex explicitly treat buying links to manipulate rankings as a violation. Consequences range from links being ignored to the site being demoted.
- One good link can outweigh many weak ones. A mention in an industry publication brings both weight and an audience; hundreds of junk links bring neither.
How to earn links honestly
- Create something worth linking to. Research on your own data, useful guides, calculators, templates.
- Work with partners. Suppliers, clients and integrators are often happy to link to a page about joint work.
- Give expert comments to media and speak at industry events.
- Find unlinked mentions. If someone wrote about you without a link, politely ask them to add one.
- List yourself in quality industry directories and on maps — without bulk submissions.