Uh, well you still need a modem. A router allows you to connect multiple computers to one network. The modem plugs into the router. The only thing you have to do is run a cable from the router to your computer. You said company, so is this at work or at home? At home you could just get a wireless modem, then it just stays where it is and you connect with a wireless jack into your computer or if your computer has wireless built in. Most laptops now do. Or you could just get a wireless router too so you don't have to worry about feeding cables all over the place. Routers are mainly for multiple computer networks. With a wireless modem you can use any computer to log on as long as it is in range. My brother has a wireless modem at my moms. He can use his laptop in his room or his PC in the basement (where the modem sits). If I knew his password I could log in when I visit since my notebook has wireless built in. But alas I don't and he won't tell me.
There are also different types of routers, you need the right one for your setup. Where I work we have a router that can connect up to 4 computers, there are only 2 on it right now because one doesn't work and the forth is just a spare line. We used to have a VPN router because we once tried connecting two separate locations together to use one server, that didn't always work so well. Now we just have a standard Cable/DSL router.
I'm going to stop adding to this now.
