What's computer network ?

A computer network is a system that consists of multiple computers and other devices connected together to share resources, exchange information, and communicate with each other. These devices are connected through various communication channels, such as wired or wireless connections, and can be located in the same building or spread across different locations. Computer networks allow users to access and share data, applications, and services, as well as collaborate with others in real-time. They can be used for various purposes, such as accessing the internet, sharing files, printing documents, and communicating through email or messaging services.