A server is a computer that provides data or services to other computers. It waits for requests and responds. Web servers serve web pages. Email servers handle email. File servers store files. Database servers manage data. Game servers host multiplayer sessions. The client-server model is fundamental to networking.

Servers are optimized for reliability and uptime. They run 24/7. They have redundant power supplies, error-correcting memory, and hot-swappable disks. They sit in racks in data centers. They are often managed remotely. Many are virtualized, running multiple operating systems on one physical machine.

Types of servers

• Web: HTTP requests and responses
• Database: stores and queries data
• File: shares files over a network
• Mail: sends and receives email
• Application: runs business logic
• Proxy: mediates traffic

Servers are the workhorses of the internet. When you load a page, check email, or play a game online, a server somewhere is doing the work. The cloud is just someone else's servers. The server is the backbone of digital life.