A computer (or program) that listens for requests and sends back responses.
A server is a computer — or a program running on a computer — that listens for incoming HTTP requests and sends back responses. When you visit a website, your browser sends a request to a server, which responds with the HTML, CSS, and JavaScript files your browser needs to display the page.
Servers handle API requests, authentication, sessions, database operations, and Encryption. They communicate using protocols like HTTPS and SSL, manage JWTs and tokens, and can push updates via WebSockets for real-time features. Middleware processes requests before they reach your routes and endpoints.
In modern development, you don't always manage your own servers — platforms like Supabase, Node.js runtimes, and cloud hosting services handle infrastructure. Edge Functions are serverless code that runs on managed servers. Docker containers package server apps for Deployment, and CDNs distribute content globally. Servers power the Backend of every Web Application and REST API.
A server listens for incoming connections on specific Ports — typically port 80 for HTTP and port 443 for HTTPS. In development, you run a local server on a custom port like 3000 or 5173.
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