A network switch is a device that connects multiple devices within a local area network (LAN). It uses packet switching to receive, process, and forward data to the destination device. By efficiently managing data traffic, a network switch helps improve communication speed and reduces network congestion. Unlike a hub, which sends data to all connected devices, a network switch intelligently directs data only to the intended recipient. This capability enhances network performance and security, making switches essential components in modern networking environments, such as offices and data centers.