Networks are systems that connect computers and devices to share resources and information. They enable communication between users and facilitate data transfer, making them essential for both personal and professional use. Common types of networks include Local Area Networks (LAN), Wide Area Networks (WAN), and the Internet. In a network, devices such as computers, servers, and routers work together to create a cohesive system. This interconnectedness allows for efficient data sharing and collaboration, enhancing productivity and connectivity in various environments, from homes to large organizations.