What a backlink is
A backlink is a link on someone else’s website that points to a page on yours. If a local newspaper mentions your shop and links to your homepage, that link is a backlink to you. If you link to the newspaper in return, that is a backlink for them. The words “incoming link” and “inbound link” mean the same thing.
Backlinks are different from links between pages on your own site. Those are covered by internal linking, which you control completely. With backlinks, other people decide whether to link, where to link and what to say, and that lack of control shapes everything else in this topic.
Why links matter
Links existed before search engines, and people use them to move between pages. They also help search engines discover pages: a crawler that finds a link to a new page can follow it. That alone is a practical reason a page with no links pointing to it can be slow to be found.
Beyond discovery, it is widely believed that search engines treat a link as a kind of recommendation. The reasoning is that someone who takes the trouble to link to a page probably found it worth mentioning. Many search engines are thought to consider the number and quality of such recommendations when deciding which pages to show for a query. Nobody outside the search engines knows exactly how, and the details change over time. It is safest to say that links are commonly believed to be one of many signals, not a switch that guarantees anything.
What is known and what is not
Some points are reasonably safe:
- Links help pages get discovered and can send visitors directly, which is valuable whether or not a search engine counts them.
- A link from a relevant, trustworthy page is generally considered more useful than a link from an unrelated or low-quality one.
- Search engines publicly discourage links created mainly to influence results, and they have ways of discounting or acting on such links.
Other points are uncertain and worth treating with suspicion when someone states them as fact:
- How much weight any one link carries.
- Whether a specific number of links is “enough.”
- Whether a particular type of site, such as a directory or a forum, helps or is ignored.
Any claim that a certain number of links will improve search visibility should be read as a guess. Search engines update how they work, and what was true years ago may not be true now.
What a good link looks like
A useful way to judge a link is to ask whether it would exist if search engines did not. A reader following an article about repairing a bicycle chain might click through to a supplier’s maintenance page. That link serves the reader. A link placed in a footer of unrelated pages, bought in bulk, or swapped in a large exchange exists mainly for the search engine, and that is the pattern to avoid.
Several features usually mark a healthy link:
- It sits within content that is related to the page it points to.
- It uses wording that describes the destination, which is the subject of anchor text.
- It appears on a page that real people read.
- It points to a page that is still working, rather than one of the broken links that arise after pages are moved or deleted.
How links come about
Most legitimate links come from a few ordinary sources. People cite a page because it is useful, original or clearly written. Businesses are mentioned by partners, suppliers, local organizations and customers. Publications link to sources they rely on. A site with helpful content has a better chance of being cited, though this is never guaranteed, and a good page can sit unnoticed for a long time.
Link building is the practice of trying to make this happen: creating resources worth citing, telling relevant people they exist, and taking part in communities where the page is genuinely useful. Done well it looks a lot like ordinary promotion. Done badly it turns into the practices covered under link schemes, which search engines discourage.
Where backlinks fit in a site evaluation
When you evaluate a site, backlinks are one input among many, alongside crawling, content, speed and structure. A reasonable approach is:
- Look at who links to you and whether those sites are relevant.
- Check that the pages being linked to still work, and fix them or redirect them if not.
- Notice whether a few pages attract most of the links while others get none.
- Watch for sudden unexplained changes, such as a flood of strange links.
- Treat all of this as context, not a score.
Comparing your link profile to a rival’s can be informative, but a fair competitor comparison keeps in mind that older, larger and better-known sites have had more time to collect links. A raw count between two sites says little on its own.
Common misunderstandings
More is always better. Quantity is a weak idea on its own. A handful of links from relevant, real sites is generally considered more valuable than hundreds from irrelevant ones, and large numbers of poor links can attract unwanted attention.
Links are the only thing that matters. A site with excellent links but unclear, thin or unhelpful pages is unlikely to satisfy visitors. Content, structure and technical health matter too.
Links produce results quickly. Links generally accumulate slowly, and the effect of any single one is hard to measure. Setting expectations for a quick change is a common cause of disappointment.
A site must act on every odd link. Most sites collect strange links over time, and search engines are generally thought to ignore the majority of them. A calm, proportionate response is usually better than alarm.
A practical starting point
If you are just beginning, the following sequence is reasonable and low risk. First, make sure the pages you want to be linked to are useful and load properly. Second, list the sites and communities that genuinely relate to your topic and check whether you are already mentioned. Third, make it easy for people to cite you, with clear titles and stable addresses. Fourth, if you contact anyone, keep the message honest and brief. Finally, review the links you have gained every few months rather than obsessing over them daily.
Results from any of this are uncertain, and nobody can promise a particular outcome. The goal is to build a site that deserves attention and to avoid shortcuts that could cause harm later.