A computer network is a collection of interconnected devices that can communicate and share resources with each other. These devices can include computers, servers, printers, and smartphones. Networks can be classified into different types, such as local area networks (LANs) for small areas like homes or offices, and wide area networks (WANs) that cover larger geographical areas. Computer networks use various technologies and protocols to facilitate communication. For example, the Internet is a vast network that connects millions of devices worldwide. Networks can be wired, using cables, or wireless, using signals like Wi-Fi. They enable users to share files, access the Internet, and collaborate efficiently.