Backlinks are incoming links from one web page to another. Google and other search engines rank websites according to the number, and especially the quality, of links from other websites to your website. So therefore, backlink building is the process of generating relevant backlinks from highly ranked websites directing traffic back to your
own website.
This is a key factor that influences how search engines crawl, and list websites. In the past, websites could undertake certain tactics such as buying large volumes of backline and other “black-hat” techniques, however, Google is in the process of implementing algorithms that heavily punish websites that have used such measures.
