The Hilltop algorithm was adopted by Google in 2003 and its main goal is to find expert pages. Expert pages publish content on a specific topic and link to many websites without affiliate links. They are considered to be independent and authoritative and appear on the top positions of the search.
Google’s search engine finds these expert pages in advance and as soon as someone searches for topics, they already choose from expert pages, not the entire Internet.
The Hilltop algorithm was extremely important for search engine optimization. If websites wanted to rank higher, they were trying hard to get a link from expert pages. One backlink could influence the ranking dramatically. However, this SEO technique was abused in the past and is less relevant today.
However, it is still important to get backlinks from authoritative pages and work on quality rather than quantity. At the same time, there should be links from smaller websites as well: if you have only links from big names, search engines will start getting suspicious.