Background sources (also known as reference sources) are tertiary and contain information we "refer" to, such as dictionaries and encyclopedias. These are good sources to use to get started - when you need ideas for how to narrow your topic, or could use more words to describe your needs (such as when thinking of keywords to put into a search box.)
Credo Reference offers background information on topics from hundreds of full-text general and subject-specific reference/encyclopedia titles, as well as 500,000+ images and audio files and over 1,000 videos.
An online collection of encyclopedias and specialized reference sources for multidisciplinary research. Small searchable and downloadable collection of electronic books on a variety of subjects.
▶ Check out our video on how to use e-books for research.
The "Overview" entries in this multidisciplinary database are very good background sources. Overviews are found at the top of the individual Topic pages.