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The server-side part of an app that handles APIs, databases, secrets, auth, and business logic.
The backend receives requests, verifies permissions, reads or writes data, calls external services, and returns responses. It is where trusted logic belongs. A good backend protects the product even when the frontend or user input is messy.
Plainly
Think of Backend as a named building block in a big LEGO app. The server-side part of an app that handles APIs, databases, secrets, auth, and business logic.
In practice
Use it when you are mapping how the app is structured or explaining a feature to a teammate or agent. In practice, define the owner, input, output, and failure mode before you rely on it.