Google Academic Search includes most published academic journals in the world. Google academic search can provide references in related databases and the ranking of search results. In this way, we can easily understand the most important academic literature in a certain field and help researchers easily grasp the research trends. This is the essential requirement of search engine service, and the search of web pages also needs to sort the search results. The number of citations is only a reference indicator of Google ranking.

The general search engine has a wider search range, but the content is not necessarily academic papers, that is, it cannot be accurately located.