If another site links to your article, product page, service page, or homepage, your site has received a backlink. You may also hear backlinks called inbound links or incoming links. The link is “back” from the linking site’s point of view; for your site, it is an incoming connection.
For example, suppose a local gardening shop publishes a useful guide to choosing compost. A gardening association links to that guide from its resources page. The association has created an outbound link, and the shop has earned a backlink. A visitor can follow it, and search engines can use the link as one clue about how pages are connected.
Why backlinks matter
Backlinks have two practical functions. First, they can send referral visitors who are already interested in the topic. A link in a relevant article may bring fewer people than a broad advertisement, but those visitors may have a clearer reason to visit.
Second, links help search engines discover pages and understand relationships across the web. A link can be a useful signal of relevance or editorial recommendation, but it is not a guarantee of rankings. Search visibility also depends on the usefulness of the page, the searcher’s intent, technical accessibility, competition, and many other signals. A large link count alone is not a quality assessment.
A backlink is a connection between pages, not a certificate that the destination is trustworthy or helpful.
The useful parts of a link
A normal HTML link looks simple: an anchor element contains a destination URL and visible words that people can click. Each part gives a site owner useful context.
Destination URL
The destination should be the page that genuinely supports the surrounding statement. A link about pricing should not unexpectedly lead to an unrelated homepage. Check that important links resolve correctly, use the preferred HTTPS URL, and do not create unnecessary redirect chains.
Anchor text
Anchor text is the clickable wording, such as “compost guide” or “compare domain metrics.” Descriptive wording helps readers decide whether to click and gives search engines context. Write it naturally for humans. Repeating an exact commercial keyword in every link is unnatural and can be a warning sign; a brand name, page title, or plain description may be more appropriate.
Relevance and placement
A relevant link in the main content is usually more useful to readers than a sitewide footer link or an isolated list of unrelated links. Relevance is not a magic formula: assess the actual page, its audience, the explanation around the link, and whether a visitor would reasonably expect it to be there.
What do sponsored, UGC, and nofollow mean?
Link attributes tell Google about the relationship between the linking site and the destination. They qualify a link; they do not turn a poor link into a good one.
rel="sponsored": Use this for advertisements, paid placements, affiliate links, or other links created as part of compensation. It makes the commercial relationship clear.rel="ugc": Use this for links added by users, such as links in comments, forum posts, or community submissions. Moderate those areas as well; an attribute does not replace spam controls.rel="nofollow": Use this when you do not want to associate your site with the destination or when the link does not fit another qualification. Multiple values can be combined, such asrel="ugc nofollow".- No
relqualification: A regular editorial link can omitrelwhen it is a normal recommendation and you are comfortable with the relationship. Do not add a made-up “dofollow” value; “dofollow” is not a special HTML attribute.
These attributes are particularly important for site owners who publish advertising, accept community contributions, or allow product reviews. Label the relationship honestly rather than trying to make every link pass ranking credit.
Earned links versus risky link schemes
An earned link exists because another publisher decided its audience would benefit from your page. It might result from original research, a genuinely useful tool, a clear explanation, a newsworthy announcement, a community contribution, or a relationship in which the publisher chose to cite you. You can encourage this process by making valuable pages easy to find and by telling relevant people about them, without demanding a link.
A risky link scheme is built primarily to manipulate search rankings rather than help visitors. Examples include buying links that pass ranking credit, exchanging links excessively, using automated link-building services, placing keyword-stuffed links in low-quality guest posts, distributing the same widget or footer link widely, and creating low-value directories or pages solely to host links. Google’s spam policies identify these patterns as link spam. Paid advertising itself is not the issue; paid links should be marked with rel="sponsored" or, where appropriate, rel="nofollow".
Be cautious when someone sells a fixed number of “high-DR backlinks,” promises guaranteed rankings, or offers links from a private network with no editorial audience. A third-party metric such as Domain Rating can help with competitive research, but it cannot prove that a link is relevant, editorial, or safe. If you compare metrics, see Domain Rating versus Domain Authority for the distinction between third-party scores.
How to evaluate a backlink
When reviewing a link, ask five straightforward questions:
- Would a real reader find this link useful in its current context?
- Is the linking page about a related subject, audience, or place?
- Does the link point to the most relevant page rather than a random destination?
- Is the relationship clear, especially if money, products, or user submissions are involved?
- Would you still want the link if search engines ignored its ranking value?
The final question is a helpful filter. A link that sends qualified visitors, supports a claim, or makes a resource easier to discover can have value even when it is qualified with nofollow or sponsored. Conversely, a link that exists only to inflate a report may create cost and risk without improving your site.
A sensible next step
Start with pages worth citing: original data, practical tools, clear tutorials, local resources, or genuinely better answers to a common question. Keep your internal links useful too, so visitors and crawlers can move between related pages. Then monitor referring domains and referral traffic rather than chasing a single score. Our guide to improving Domain Rating sustainably explains how to think about link quality without making ranking promises.
If you want a quick benchmark of a domain’s third-party link profile, you can check a domain on this site. Treat the result as a starting point for inspection, not a verdict on the website or on any individual backlink.
Sources
- Ahrefs: What Are Backlinks in SEO? — definition, discovery, and link-quality context.
- Google Search Central: Qualify Your Outbound Links to Google — guidance on
sponsored,ugc, andnofollow. - Google Search Central: Spam Policies for Google Web Search — examples of link spam and paid-link handling.