The MacBook is a brand of Macintosh notebook computers manufactured by Apple Inc. from early 2006 to late 2011. It replaced the iBook series and 12-inch PowerBook series of notebooks as a part of the Apple–Intel transition from PowerPC. Positioned as the low end of the MacBook family, the Apple MacBook was aimed at the consumer and education markets. It was the best-selling Macintosh in history, and according to the sales-research organization NPD Group in October 2008, the mid-range model of the MacBook was the single best-selling laptop of any brand in US retail stores for the preceding five months.
There have been three separate designs of the MacBook: the original model used a combination of polycarbonate and fiberglass casing that was modeled after the iBook G4. The second type, introduced in October 2008 alongside the 15-inch MacBook Pro, used a similar unibody aluminum casing to the 15-inch Pro, and was updated and rebranded as the 13-inch MacBook Pro at the 2009 Apple Worldwide Developers Conference in June 2009. A third design, introduced in October 2009, used a unibody polycarbonate shell as aluminum is now reserved for the higher-end MacBook Pro. On July 20, 2011, the MacBook was quietly discontinued for consumer purchase in favor of the new MacBook Air. Apple continued to sell the MacBook to educational institutions until February 2012. The MacBook has effectively been superseded by the MacBook Air.