AirPort Express, AirPort Extreme, and AirPort Time Capsule
The AirPort Express functions as a wireless access point when connected to an Ethernet network. It can be used as an Ethernet-to-wireless bridge under certain wireless configurations. It can be used to extend the range of a network, or as a printer and audio server.
The AirPort Time Capsule is a wireless router sold by Apple Inc., featuring network-attached storage and a residential gateway router, and is one of Apple's AirPort products. They are, essentially, versions of the AirPort Extreme with an internal hard drive.