can someone explain what airport express does?

i own a normal windows laptop on xp and the internet in my house doesn't reach up to my bedroom, i was thinking about buying an airport express because i could then play xbox live in my room as well but I'm not sure if its a router that has a separate internet or if it just extends the connection of my BT connection.

my BT connection is terrible anyway, if i bought an airport express would i have a good connection in my room?

thanks

nick

is your router wireless?

Airport express is just a wireless base station, it will add wireless to any non wireless router tho

http://en.wikipedia.org/wiki/AirPort

yes its wireless.