A backlink is anytime a website links to a specific page on an external website. Such backlinks play an essential role in the majority of search engine algorithms.
A backlink is basically an incoming hyperlink from one site to another. Whenever a website has numerous quality backlinks, they may observe an improvement in its searchability and performance. Whenever a separate website links to a different website, they are practically endorsing that website and providing them the “juice” necessary to gain SEO-reputation.
When such links arrive from a reputable website, like a .org, .gov, or any well-known firm, that website gains a lot of power in terms of SEO.