A 10G switch is a network switch that supports 10 Gigabit Ethernet. It is used to connect multiple devices together on a network, allowing them to communicate with each other. 10G switches are typically used in enterprise networks, data centers, and other high-bandwidth applications. They offer higher speeds and lower latency than traditional 1G switches, allowing for faster data transfer and improved performance. 10G switches are available in both managed and unmanaged versions, allowing for greater flexibility and control over the network. They are also more reliable and secure than their 1G counterparts, making them ideal for mission-critical applications.