Background is a noun that refers to:
1. The part of a picture or scene that appears behind the main objects or people
2. A person's education, experience, and social circumstances
3. The circumstances or situation prevailing at a particular time or underlying a particular event
4. In computing, processes that run without user intervention
Common phrases:
- Background check: A process of verifying a person's credentials
- Background music: Music played at a low volume
- Background information: Contextual details about a subject