Hubs

Intro
An Ethernet hub, active hub, network hub, repeater hub, multi-port repeater, or simply hub is a device for connecting multiple Ethernet devices together and making them act as a single network. Hubs however are now largely obsolete, having been replaced by network switches except in very old installations or specialized applications.

Usages:
The main use is to provide a network where all servers and client computers work in sync together to provide a fully functioning network for an organisation.