Network devices are hardware components that facilitate communication and data transfer between computers and other devices within a network. Common types of network devices include routers, switches, hubs, and modems. Each device plays a specific role, such as directing data traffic, connecting multiple devices, or providing internet access. These devices work together to create a functional network, allowing users to share resources and access information efficiently. For instance, a router connects different networks, while a switch connects devices within the same network. Understanding these devices is essential for setting up and maintaining a reliable network.