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A switch is a device that connects multiple computers on a local area network (LAN) effectively. It operates at the data link layer (Layer 2) of the OSI model and intelligently forwards data packets between devices on the network based on their MAC addresses. This means that the switch can send data only to the specific device that needs it, rather than broadcasting it to all devices, which enhances network efficiency and performance.

Moreover, switches can also handle more significant amounts of data traffic and manage collisions better than simpler devices like hubs. This makes them ideal for modern networks, where multiple devices frequently communicate with each other. Thus, using a switch improves both speed and security within the local network, creating a more robust network environment.

So, when considering which device connects multiple computers on a LAN, the switch stands out as the ideal choice due to its ability to manage traffic more effectively and direct communications properly among devices.