A computer network is a collection of devices connected together to exchange information and share resources. Networks can range from a small local area network (LAN) within a single building to a large, worldwide network of computers and other devices connected via the Internet.

Networks allow devices to communicate with each other and exchange data, enabling the sharing of resources such as printers, storage, and software applications. They also provide a way for users to communicate with each other, whether through email, instant messaging, or other forms of digital communication.

There are various types of computer networks, including:

1. Local Area Networks (LANs)
2. Wide Area Networks (WANs)
3. Metropolitan Area Networks (MANs)
4. Wireless Networks (WLANs)
5. Cloud Computing Networks
6. Virtual Private Networks (VPNs)

Each type of network has its own unique characteristics and uses, but all are important for the functioning of modern organizations and businesses.