🔍 SEO / GEO

Backlink

backlink · back link · inbound link · incoming link · external link · link building

Definition

A backlink is an inbound hyperlink from an external site that passes link equity (PageRank) and acts as one of the key off-page ranking factors in search engines.

How backlinks work

The PageRank concept underlying Google treats a link as one site voting for another. The more authoritative sites link to a page, the higher its PageRank and, as a consequence, its position in the results.

Other search engines apply the same logic through their own authority metrics, and all of them run algorithmic filters against purchased links. The difference between engines is in the aggressiveness of those filters rather than in the principle.

What makes a link valuable

Factor	Influence
Authority of the referring domain (DR/DA)	High — a link from a strong site passes more weight
Topical relevance	High — a link from a relevant resource beats an off-topic one
Position on the page	Medium — links in the main content beat footer or sidebar links
Anchor text	Medium — an exact anchor strengthens the signal, but repetitive anchors look unnatural
follow / nofollow	Direct — follow passes PageRank; nofollow does not, though the mention still has value

Links in e-commerce: what is different

Link strategies are harder in e-commerce than in media: product and category pages rarely attract links organically. The approaches that work:

Data and research. Publishing original statistics about the market or about shopper behaviour is one of the best ways to earn links from media and trade blogs.
PR and brand mentions. Track unlinked brand mentions, using Ahrefs or a media-monitoring tool, and ask for a link to be added.
Partner integrations. Joint case studies with suppliers and vendors often produce links from relevant B2B resources.
Manufacturer brand pages. If you are an authorised dealer, ask the manufacturer to link to your catalogue.

Important: buying links breaks search engine guidelines. When an unnatural link profile is detected, manual penalties are possible, and lifting one is considerably harder than escaping an algorithmic filter.

Monitoring the link profile

Check the profile regularly through Ahrefs, Semrush or the Links report in Google Search Console. Watch for:

Abnormal link growth over a short period
A high share of exact-match anchors carrying commercial keywords
Links from sites blocked from indexing or showing signs of spam

Frequently asked questions

Are all backlinks equally valuable?

No. The value of a link is set by the authority of the referring domain (Domain Rating or Domain Authority), topical relevance, the position of the link on the page (main content versus footer versus sidebar) and the anchor text. A nofollow link does not pass PageRank directly, but Google may still treat it as a signal of a mention.

What is a link profile and why does it matter?

A link profile is the sum of all backlinks: how many there are, how they spread across domains, the follow to nofollow ratio and the variety of anchors. An unnatural profile — a sudden spike, repetitive anchors, spammy referring sites — can trigger manual filters at Google and at other search engines.

How does an e-commerce site earn quality links?

The channels that work for e-commerce: publishing case studies and original research, since journalists link to data; PR placements in trade media; partner integrations with brands; and directories and rankings. Buying links breaks the guidelines of every major engine and carries a penalty risk.

What should you do about low-quality links pointing at your site?

Use the Disavow Links tool in Google Search Console, or the equivalent console of another engine, to reject links you do not control. Before disavowing, confirm that the links genuinely cause harm — needlessly rejecting good links costs you rankings.