The MacBook Air is a Macintosh notebook computer designed by Apple, described as the "world's thinnest notebook." It is positioned as the ultraportable in Apple's MacBook family and was introduced at the Macworld Conference & Expo on January 15, 2008. The MacBook Air was the first laptop to implement Apple's precision aluminum unibody enclosure.
The MacBook Air has been revised three times since the original release. The first revision introduced higher performance, a larger hard drive, and a Mini DisplayPort. The second revision, introduced with the MacBook Pro family, featured a lower price, higher performance, and longer battery life. It was revised once again in October 2010 with the addition of a smaller, 11.6-inch (29 cm) display option
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