What does AirPort Express actually do?

Hello,
The AirPort Express is meant to let you create a wireless Internet access point anywhere -- at home, in a hotel room or just about any place you need a fast, dependable connection. It also lets you stream all sorts of multimedia goodies to various devices and extend the range of an existing wireless network.
Thanks.
For More go to:-
Setup AirPort Extreme
Apple AirPort Setup
Reset AirPort Extreme