A Network System refers to a collection of interconnected devices that communicate with each other to share resources and information. These devices can include computers, servers, routers, and switches, which work together to facilitate data exchange. Network systems can be local, like a home network, or extensive, like the Internet, which connects millions of devices worldwide. In a network system, data is transmitted through various protocols, ensuring that information is sent and received accurately. Common types of network systems include LAN (Local Area Network), WAN (Wide Area Network), and VPN (Virtual Private Network), each serving different purposes and scales of connectivity.