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The part of the app the user sees and interacts with in the browser.
The frontend includes pages, components, forms, styling, client-side behavior, and accessibility. It calls APIs but should not be trusted with secrets or privileged logic. If a user can inspect it in the browser, assume it is public.
Plainly
Think of Frontend as a named building block in a big LEGO app. The part of the app the user sees and interacts with in the browser.
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.