use case

noun3

1. •
   A potential scenario in which a system receives an external request (such as user input) and responds to it.
2. •
   A usage scenario for a piece of software; often used in the plural to suggest situations where a piece of software may be useful.

   • So Amazon unveiled more software services to make A.W.S. indispensable. In a speech at the event, Andy Jassy, the head of A.W.S., said it wanted to “enable every imaginable use case.” — 2019
3. •
   A usage scenario for a product, such as a piece of equipment or a tool.