Switches are a series of networking devices designed to connect devices within a local area network (LAN). They come in both managed and unmanaged options, and offer a range of features like Quality of Service (QoS), VLAN tagging, and link aggregation. They are available in various port configurations, including 8, 16, 24, and 48 ports, and are ideal for small to medium-sized businesses that need to connect multiple devices.