Hi,
Wifi means net without wire. Anyhow you must have an ADSL adaptor somewhere (out in the netcafe, or at home in your house attached to a telephone line), or a cablenet along with your cable tv. I dunno how cablenet works, but I know, you need no telephone line for that net connection.
After you have the adapter, you can start wondering if you`ll use a PC, and use wires, or a wifi card, or you plan to pay a huge amount for a cool laptop and use it without cable (Wifi).
