User Story
In plain terms
A short, user-centered description of a desired feature.
Going deeper
A user story frames work from the user's perspective ('As a user, I want X so that Y'), keeping focus on value rather than implementation. It's a unit of work in Agile planning.
Under the hood
Captures who/what/why and is sized for one iteration; the INVEST criteria and acceptance criteria keep stories independent and testable.
Examples
'As a shopper, I want to save items so I can buy later', story points, acceptance criteria.
Think of it like...
Like a movie pitch told from the audience's view, what they'll experience, rather than a technical shot list.