Backlinks (also known as “inbound links”, “incoming links” or “one way links”) are links from one website to a page on another website. Google and other major search engines consider backlinks “votes” for a specific page. Pages with a high number of backlinks tend to have high organic search engine rankings.
For example, here is a link from Forbes to my website.
Because that link points directly to a page on my website, it’s a “backlink”.
Backlinks are basically votes from other websites. Each of these votes tells search engines: “This content is valuable, credible and useful”.
So the more of these “votes” you have, the higher your site will rank in Google and other search engines.