Google algorithm is a set of rules, codes or commands that enables Google to return search results relevant to the queries made by the users. It is the Google’s algorithm that allows it to rank the websites on SERPs on the basis of quality and relevancy. The websites with quality content and relevant information tend to remain at the top of the SERPs.
So, Google is a search engine that is based on a dynamic set of codes called algorithm to provide the most appropriate and relevant search results based on users’ queries.