A network switch functions in computer networking by connecting devices within a local area network (LAN) and intelligently forwarding data packets to the appropriate devices. Unlike a hub, which broadcasts data to all ports, a switch uses MAC (Media Access Control) addresses to send data only to the intended recipient, improving network efficiency and security. Switches operate at the data link layer of the OSI model and can manage multiple simultaneous communications. By effectively managing traffic, a network switch enhances overall network performance, reducing congestion and increasing speeds for connected devices.