Academic OneFile is a multi-subject general database. You can use it to find academic/scholarly journal articles (including peer-reviewed), magazine articles, and newspaper articles. It also has some books, videos, audio files, and images. It covers a wide range of topics, and is a good place to start your search.
The library has several subject-specific databases provided by Gale. The information provided on this page, as well as the video, is applicable to most of these databases, with the exceptions of Gale Opposing Viewpoints and Literature Criticism Online.