The MacBook is a brand of Macintosh notebook computers designed and marketed by Apple Inc. that use Apple's macOS operating system since 2006. It replaced the PowerBook and iBook brands during the Mac transition to Intel processors, announced in 2005. The current lineup consists of the MacBook Air (2008present) and the MacBook Pro (2006present). Two different lines simply named 'MacBook' existed from 2006 to 2012 and 2015 to 2019. On November 10, 2020, Apple announced models of the MacBook Air and MacBook Pro incorporating the new Apple M1 system on a chip. Overview The MacBook family was initially housed in designs similar to the iBook and PowerBook lines which preceded them, now making use of a unibody aluminum construction first introduced with the MacBook Air. This new construction also has a black plastic keyboard that was first used on the MacBook Air, which itself was inspired by the sunken keyboard of the original polycarbonate MacBooks. The now standardized keyboard brings congruity to the MacBook line, with black keys on a metallic aluminum body. The lids of the MacBook family are held closed by a magnet with no mechanical latch, a design element first introduced with the polycarbonate MacBook.