The USB LAN is a type of USB network adapter, which allows you to connect a computer to a wired Ethernet network. It typically includes a USB connector on one end and an RJ45 Ethernet port on the other, allowing you to plug in the adapter to a USB port on your computer and connect it to an Ethernet cable. This adapter can be useful if your computer doesn’t have an Ethernet port built-in or if you want to add an additional network connection.