In the world of SEO, a backlink is simply a link from one page to another, however these are one of the most important aspects of SEO. A site with many quality backlinks will be listed higher in search engines than competing sites with less.
So what is a quality backlink? It's a link originating from a site that the search engine considers "quality". For example, if The New York Times links to your site, you can bet that'll help your search engine rankings. The reason a site like The New York Times is considered quality is both mysterious and obvious: while search engines don't reveal exactly how they rate websites, it has to do with having quality, original content, quality links, shares on social media, and so on, but that's a whole other topic.
A backlink checker is a tool that allows you to investigate which sites link to others, and whether those links are high quality. This is extremely useful in gauging how your website is doing in this aspect of ranking.
Another extremely effective way to use these tools is to check the backlinks of competing websites. This can potentially highlight ways to promote your website in a similar way.
As you might imagine, this information is quite valuable. That's why a lot of these tools cost money to use, or for their pro features. Others are free, and you'll find them listed below.
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