The MacBook Air is a Macintosh notebook computer designed by Apple. It is positioned as the ultraportable in Apple's MacBook Family and was introduced at the Macworld Conference & Expo on January 15, 2008. Apple describes it as the "world's thinnest notebook".
To reduce the computer's size and weight, Apple omitted certain features long standard on laptops. It is Apple's first notebook since the PowerBook 2400c without a built-in removable media drive. Users may purchase an external USB SuperDrive, or use bundled Remote Disc software to access the optical drive of another computer. It is the first subcompact laptop offered by Apple since the full-featured 12" PowerBook G4 was discontinued in 2006.
Similarly to the PowerBook Duo series which preceded it, it lacks many features of the larger MacBooks, including a security slot and an Ethernet port, (although a USB-to-Ethernet adapter may be purchased separately). The MacBook Air has a single USB port. Like the entry-level MacBook, the MacBook Air lacks Cardbus and ExpressCard slots, and does not have a FireWire port.