Backend

Backend (also called server-side) is everything that happens behind the scenes of a website or app: servers, databases, business logic, authentication, and APIs that feed data to the screen.

Users never “see” the backend the way they see buttons and layouts, but they feel it when login works, orders save, or a dashboard loads the right numbers. Backend developers write the code that stores and retrieves data, enforces rules, and talks to other systems. It pairs with front-end development: the front end is the storefront; the backend is the stockroom, cash register, and inventory system.

A real-life example of a backend

You tap “Buy” on a phone. The pretty button is front end. Checking stock, charging a card, sending a confirmation email, and updating the order database — that’s backend work, often on hosting or cloud servers.

Someone who builds both sides is often called full stack. Common backend stacks include Node.js, Python, PHP, Ruby, and databases like PostgreSQL or MySQL.