The backend (or back-end) refers to the server-side components of websites and applications that users do not directly see or interact with. While the frontend is what appears on your screen, the backend handles data processing, storage, security, and business logic. When you submit a form online, the backend receives your data, validates it, stores it in a database, and sends confirmation back to your screen. Backend development involves programming languages, databases, and servers. Government digital services rely on secure, well-designed backends to protect citizen data and ensure reliable service delivery.