1. Servers & Logic
Understand what a web server is, how it hosts code, and the role of server-side languages like Node.js and PHP in processing requests.
Explore Server Logic →
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The Engine Room: Backend
The Backend is the hidden brain of the application. It handles logic, data storage, security, and communication, making the Frontend actually work.
Client vs. Server: The Core Relationship
Every interaction on the web is a conversation between the Client (your browser) and the Server (a powerful, dedicated computer). The client sends a request for data or action, and the server processes it and sends back a response.
The Backend's Responsibilities
- Data Storage: Managing information in databases (e.g., user accounts, product lists).
- Business Logic: Running the complex rules that govern the application (e.g., calculating tax, validating a password).
- Security: Ensuring sensitive operations and data transfers are protected.