What does an Apple AirPort Extreme do?

Hello,
AirPort Express is a lightweight router designed for music sharing. AirPort Extreme is a more powerful router with additional ports and features. Time Capsule is essentially an AirPort Extreme with a built-in hard drive for wireless file sharing and Time Machine backup.
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For More go to:-
AirPort Extreme Setup
Setup AirPort Extreme
Apple AirPort Setup