This database, freely available from Google, is one of the most important scholarly databases, especially in the natural and social sciences. It brings the power of Google to the search for academic/scholarly publications, including journal articles, books, theses and dissertations, and other research documents. Google creates this database from "academic publishers, professional societies, online repositories, universities and other web sites" -- website. It has incredibly powerful citation searching features, which enable you to easily locate sources that cite a particular document (using the "Cited by" feature) and to find similar documents which often share related citations (using the "Related Articles" feature).
When using Google Scholar off campus, be sure to set your Scholar Preferences to use the Shippensburg University proxy to access library full-text through the "Full-Text@My Library" linking feature.