Network systems refer to the interconnected group of computers and devices that communicate with each other to share resources and information. These systems can include local area networks (LANs), wide area networks (WANs), and the internet. They enable users to access data, applications, and services from various locations, enhancing collaboration and efficiency. In a network system, various components such as routers, switches, and servers work together to manage data traffic and ensure reliable connections. Security measures, like firewalls and encryption, are also essential to protect sensitive information from unauthorized access. Overall, network systems play a crucial role in modern communication and data management.