What is Google Scholar?
Google Scholar searches scholarly literature from web pages, publisher web sites, professional societies and some article databases. It has recently been expanded to include patents and legal opinions.
Why use Google Scholar
Google Scholar is a very good starting point for verifying a citation or performing a broad search across disciplines. It is also useful for finding conference papers and other grey literature that is not always included in article databases.
Why Not Use Google Scholar
Even though Google indexes publisher content, it does not include everything available on a topic. It also includes many sources that may not be relevant for your topic. Article databases from the Library are better for most research questions.