Google Scholar is a search engine focused solely on scholarly books, articles and documents.
It is completely separate from the main Google search. Instead of searching the whole world wide web, it is focused on the same kinds of scholarly books, articles and documents that you might search in your University Library database.
The extension adds a simple yet powerful feature that allows you to search inside the box that opens when you click the extension icon. It comes really handy when you do cross-referencing articles.
Install Google Scholar Button