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) and wide area networks (WANs), depending on their size and scope. Computer networks use various technologies and protocols to facilitate communication. Common protocols include Transmission Control Protocol (TCP) and Internet Protocol (IP), which help ensure data is transmitted accurately. Networks can be wired, using cables, or wireless, using Wi-Fi technology, allowing for flexible connectivity options.