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What is a server?

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Quick answer

A server is a computer that stores data or runs services and sends them to other computers, called clients, when they ask over a network. Your phone or laptop requests a web page, and a server somewhere responds with the files, so the page appears on your screen.

A server is a computer that provides data or services to other computers, called clients, over a network. When you visit a website or send an email, a server somewhere stores the information and sends it to your device.

Step by step

  1. A client device, such as your phone or laptop, sends a request across the internet to a server.
  2. The request travels through network equipment like routers and switches until it reaches the correct server.
  3. The server receives the request and identifies what data or service the client is asking for.
  4. The server gathers the requested files or runs the needed program, such as fetching a web page.
  5. The server sends the response back through the network to the client device.
  6. The client receives the data and displays it, completing the exchange.

Key things to understand

  1. It's a computer that serves data or services to others.
  2. Other devices (clients) request things from it.
  3. Servers power websites, email, apps, and games.
  4. They often run constantly in data centers.

Labelled diagram

  1. Client

    Your device sends a request for a web page or service.

  2. Network

    Routers and cables carry the request to the right server.

  3. Server

    It finds the data or runs the program requested.

  4. Response

    The server sends the data back through the network.

  5. Client displays

    Your device shows the page or plays the video.

How a client gets data from a server

Real-world examples

  • When you open a website like Wikipedia, your browser asks a web server for the page, and the server sends back the text and images.
  • Sending an email uses a mail server that stores your message and forwards it to the recipient's mail server.
  • Playing an online game connects your console to a game server that tracks players and keeps the match synchronized.
  • Streaming a video from YouTube uses media servers that send video chunks to your device as you watch.

Common mistake

✗ Myth: A server is a special, mysterious type of computer completely different from a normal PC.

✓ Fact: A server is just a computer optimized to provide services to many clients at once, often with more memory and processing power. Any computer can act as a server if it runs server software and is connected to a network.

People also ask

What does a server do?
A server stores data, runs programs, and provides services to other computers called clients. When a client requests something, like a web page or an email, the server processes the request and sends back the result. Servers often handle many requests at once and run continuously so services stay available.
What is the difference between a server and a normal computer?
A normal computer is designed for one person to use interactively, while a server is built to serve many clients over a network. Servers usually have more powerful hardware, run continuously, and often lack a monitor or keyboard. However, the core components are similar; the main difference is their role and software.
What are the main types of servers?
Common types include web servers that host websites, mail servers that handle email, file servers that store and share files, and database servers that manage organized data. There are also game servers, application servers, and DNS servers that translate domain names. Each type is optimized for its specific task, but all provide services to clients.
What is a server in simple terms?
A computer that stores information or runs services and sends them to other devices that request them.
What's the difference between a server and a client?
A server provides data or services; a client (like your phone or laptop) requests and uses them.
Where are servers located?
Often in data centers — large facilities full of servers running around the clock.

Part of the guide: How the Internet Works →