A backlink is a link created when one website is linked to another. Backlinks are also called "inbound links" or "incoming links". Backlinks are also called inbound links because they represent traffic from another website coming to your own site.
They are links from one page of one website to another. If someone links to your site, you have backlink from them. If you link to another website, they have backlink from you. The quality and quantity of your backlinks can help you rank better on search engines such as Google and Bing. But remember, it is not the number of backlinks, but the quality that makes the difference in ranking. Backlinks play an important role in search engine algorithm, SEO and your overall strategy for developing your website.
There are two basic types of backlink. Nofollow backlinks and Dofollow links. The Nofollow tag tells search engines to ignore the link. While Dofollow links are a type of backlink that can help you improve search engine rankings. The Dofollow links are considered toxic, from suspicious sites or obtained in violation of search engine terms, and this may cause Google to penalize the host site.