A backlink is an inbound link to a website. In basic link terminology, a backlink is any link received by a web node (web page, directory, website, or top level domain) from another web node. Backlinks are also known as incoming links, inbound links, inlinks, and inward links.
Backlink services are a dime a dozen, and most of them don’t work. The few that do work are either expensive, or they use black hat techniques that will get your site penalized by Google. So be very careful when choosing a backlink service.
There are many backlink services available that can help to improve your website's ranking in search engines. However, it is important to choose a reputable service that can provide high-quality backlinks. Otherwise, you may end up with low-quality links that can actually harm your website's reputation.