The half of your app you can't see — and why every security rule has to live there

Frontend, server, database, API, secrets: the parts behind the glass, drawn as the journey of one tap, and why the safety checks can only work on… Aliteq Syntax · Build Editor

The backend is everything your app does that the user can't see or touch: the code running on a computer somewhere else (the server), the place your data is kept (the database), and the private keys…

Frontend: what runs on the user's device. Anyone can read it.

Backend: the server, the database and your secrets. Runs somewhere you control.

The journey: tap → request → server → database → response

Why you care: security rules belong in the backend, never only in the frontend

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