Hub

A. Definition: A hub is a small, simple, inexpensive network device that joins multiple computers together
One good way to differentiate between Ethernet hubs is by the speed (data rate) they support.
The most basic Ethernet hubs support 10 Mbps speeds. Newer hubs support 100 Mbps Ethernet. To help users move ahead to the newer technology while still supporting the old, some hubs support both 10 Mbps and 100 Mbps data rates. These are so-called "dual-speed" or "10/100" hubs.

A common differentiator in hubs is the number of ports they support. Four- and five-port hubs are most common in home networks, but eight- and 16-port hubs can be found in some home and small office environments.