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The user-side part of an app, usually the browser or mobile app.
Client code handles interaction, display, and local state. It talks to servers through requests, APIs, cookies, and real-time connections.
Plainly
Think of Client as a named building block in a big LEGO app. The user-side part of an app, usually the browser or mobile app.
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.