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. It has been revised twice since the original release.

When the MacBook Air was introduced, Apple described it as the "world's thinnest notebook". In March 2009, Dell challenged that claim with the release of the Dell Adamo