Network switch is a small hardware device that joins multiple computers together within one local area network (LAN).This device receives signals from each computer on the network via Ethernet cables in a wired network or radio waves in a wireless LAN. So networking switch directs traffic across the LAN and enabling the computers to talk to each other and share resources.
Switches can limit the traffic .So that each device connected to the switch has a sufficient amount of bandwidth. We can say that Switch are more advantage able that using a hub for the network. Because it use Uncasing method instant of broadcasting method.