An uplink may refer to any of the following:
1. A port found on network hubs, switches, and routers that allows a connection between computers or other network devices. For example, a home network may have a router connected to a broadband connection through the uplink port, so an Internet connection can be shared with all computers on the network.
2. An uplink is also a one-way connection from a device such as a cell phone to a network or server.