What exactly are "Households" at the Help Desk Case Mangement

Summary:

I'd love to have an exact definition of the households at case management

Content (required):

I would like to know what exactly I can imagine as the so-called households that can be assigned to the cases and what the names are standing for.

Version (include the version you are using, if applicable):

Redwood

Code Snippet (add any code snippets that support your topic, if applicable):