Hi, golfisart--
The FS105 to which PaulCal1 referred is a SWITCH, meaning, you can share a connection among several computers like a hub, and the connection between them is FULL DUPLEX--each computer has a full 10- or 100-Mbit bandwidth, whereas a HUB is HALF DUPLEX, meaning that ALL of the computers share the bandwidth.
A ROUTER, on the other hand, allows you to rout IP's from one network to another, such as if you had your LAN (Local Area Network) connected to a WAN (Wide Area Network), like the internet. This particular router also can act as a firewall, keeping unwanted activities out of your LAN. This router only has one port IN and one port OUT. You can plug the router into your SWITCH, and share the a single internet connection among several different computers. Hopefully, this will clarify the issue for you.