The difference is with a 'conventional' internet connection, i.e connecting to a hard wired telephone (landline) the signal appears on a telephone lead which then plugs into a 'router' which is called an ADSL router. There are various types, ones that just convert the ADSL signal to an ethernet connection for a hard wired connection, and another that provides the signal as a wireless connection.

Iberbanda, on the other hand, provide an ethernet connection - the same as you would get on the ADSL box mentioned above.  There is no wireless connection so you need to add a wireless access point, which is different from an ADSL wireless router in as much as you can't plug it in to a conventional telephone line.  The entry for the internet to the access point is an ethernet connection rather than a telephone line.

Unfortunately the terms for the various things you plug an ethernet connection into are becoming a bit muddled these days.  There are hubs, routers, ADSL routers, and wireless access access points to name but a few. Each have their own function and some have the function of more than 1 device at the same time.

Basically a router will isolate you from a public IP address and provide a local network and will contain a DHCP server.  When you get an Iberbanda connection you will get what is called a public IP address (it can change as it is not a fixed address). When you connect your computer directly to an Iberbanda box this address will be passed on to your computer.  Your computer can then connect to the internet BUT someone elsewhere on the internet can see your computer unless you use a firewall and have it configured to block anyone seeing it.

With a router in place, the IP address passed to your computer is a local address and is not visible outside of your local network so nobody can access your machine - the router acts like a block to anyone trying to get to your computer (look up NAT - Network Address Translation on Google to see how it all works).

A wireless access point is basically a router that has, as its connection to the internet, a plug that plugs into an ethernet connection rather than an ADSL broadband router, which as its connection plugs into a telephone socket.  They provide the same thing, but with different connections.  Also, in my experience, Wireless Access Points are generally cheaper than ADSL routers.

I also use a Linksys device, a WAP54G to be exact, which  is an access point, not an ADSL router.

Nigel