---
title: "Server"
description: "A server is a computer or program that provides services and data to devices on a network. Learn the client-server model, server types and their uses."
url: "https://nodea.io/en/glossary/server"
lang: "en"
updated: "2026-07-13"
---

# Server

> A server is a computer or program that provides resources, data and services to other devices (clients) on a network, handling their requests — from serving web pages, through email, to storing files and databases.

A **server** is a computer or program whose job is to provide resources, data and services to other devices on a network, known as clients. The term has two meanings: it can describe a physical machine designed for continuous, reliable operation, or software acting as a service provider — a web, mail or database server, for example. In both cases the essence is the same role: listening for requests and responding to them.

## How a server works

A server operates on the **client–server** model. A client (a browser, a mobile app, another program) sends a request — for instance to display a page — and the server processes it and returns a response, such as the page's HTML. Servers run without interruption, around the clock, handling many requests in parallel, which is why server machines are built for reliability: redundant power supplies, powerful processors, plenty of RAM and fast [NVMe drives](https://nodea.io/en/glossary/nvme).

Depending on their function, servers are grouped into web servers (powered by software such as [Nginx](https://nodea.io/en/glossary/nginx) or Apache), mail, DNS, file, database and application servers. By form, servers are divided into physical (dedicated, bare metal) and virtual, where virtualization carves many independent instances out of a single machine.

## Practical application

Every page you visit, every email you send and every file you download involves a server at work. Companies rely on servers to publish websites and stores, store data, and host applications and databases. The most common models are shared [hosting](https://nodea.io/en/glossary/hosting) (many customers on one machine), a [VPS](https://nodea.io/en/glossary/vps) (isolated, dedicated resources with full control), and a dedicated server (an entire machine at your disposal). For mission-critical services, [high availability](https://nodea.io/en/glossary/high-availability) setups are built in which the failure of a single server does not interrupt the service. The choice depends on the scale of traffic, performance requirements and the level of control needed over the environment.

### How does a physical server differ from a virtual one?

A physical server is an actual machine (hardware). A virtual server (such as a VPS) is an isolated slice of that machine's resources, acting as a standalone server thanks to virtualization. A single physical machine can run many virtual servers, each with its own operating system and resources.

### Is a server always a separate computer?

Not always. The word "server" refers to both a device and software acting as a service provider. A server can be a powerful machine in a data centre, but also a program (for example a web server) running on an ordinary computer. What matters in practice is the role: providing services to clients.

## Related

- [Hosting](https://nodea.io/en/glossary/hosting)
- [VPS](https://nodea.io/en/glossary/vps)
- [Managed Server](https://nodea.io/en/glossary/managed-server)
- [Nginx](https://nodea.io/en/glossary/nginx)
- [High availability (HA)](https://nodea.io/en/glossary/high-availability)

---

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