You connect your devices to it, and then connect the switch to your router. Your devices will then be able to access your home network as if they were connected to the router directly.

How to Properly Test an Ethernet Switch. For small businesses that need to connect a large number of nearby computers to the Internet, setting up a local wired network may be a cheaper solution ...

Switches connect network segments, providing full-duplex communication, valuable network performance data and efficient use of network bandwidth.