Search engines strive to provide all resources with equal access to the first positions in the search results, therefore they are constantly improving their algorithm for evaluating the quality of sites. About 5 years ago, it was possible to promote almost any site to the TOP by simply purchasing a large number of links.

Unscrupulous webmasters abused this method, so Google made changes to their algorithms. Now the search engine takes into account not only the quantity, but also the quality of seo backlinks link building