Switches connect multiple devices within a local area network (LAN) to enable seamless communication between them. They operate at the data link layer of the OSI model and use MAC addresses to forward data frames to the correct destination devices. Benefits include improved network performance and reduced collisions, as switches create a separate collision domain for each connected device, which boosts data transfer efficiency. Types include unmanaged switches for basic connectivity in small networks and managed switches for more complex setups with features like VLAN configuration. Key role is to provide reliable and efficient data transmission, supporting multiple devices and applications across the network. Important attributes vary by model and include function, compatibility, size, material, and performance. Check specifications for footprint, mounting options, and materials. Use cases - In a small office or home office, connect computers, printers, and a NAS to a single switch for reliable LAN access. - In a small business, use a managed switch to configure VLANs for traffic separation and security. - In a classroom or meeting room, provide stable connections for presentation gear and streaming devices.