Dev MaxxingBeginnerApplication Layers60 sec

Backend

The backend is the part of an application that runs on a server, handling business logic, data storage, and requests that the frontend can't safely or capably handle itself.

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Prerequisite: Frontend

What matters

Because it runs on infrastructure the developer controls, the backend is where sensitive operations, like checking a password or charging a payment, must be enforced.

Example

Verifying a submitted password against a stored hash happens on the backend, never trusting a check performed only in the browser.

Common misconception

The backend is not just 'the database'; it includes all the server-side application logic that decides what to do with data, not only where it's stored.

Recall question

Why must sensitive checks, like password verification, happen on the backend?

Keywords and related concepts

backendserver-sidebusiness logicfrontend