<Tr> <Th> Website </Th> <Td> Apple--iMac </Td> </Tr> <P> iMac is a family of all - in - one Macintosh desktop computers designed and built by Apple Inc . It has been the primary part of Apple's consumer desktop offerings since its debut in August 1998, and has evolved through seven distinct forms . </P> <P> In its original form, iMac G3 had a gumdrop or egg - shaped look, with a CRT monitor, mainly enclosed by a colored, translucent plastic case, which was refreshed early on with a sleeker design notable for its slot - loaded optical drive . The second major revision, iMac G4, moved the design to a hemispherical base containing all the main components and an LCD monitor on a freely moving arm attached to it . The third and fourth major revisions, iMac G5 and the Intel iMac respectively, placed all the components immediately behind the display, creating a slim unified design that tilts only up and down on a simple metal base . The fifth major revision (mid-2007) shared the same form as the previous model, but was thinner and used anodized aluminum and a glass panel over the entire front . The sixth major revision (late 2012) uses a different display unit, omits the SuperDrive, and uses different production techniques from the older unibody versions . This allows it to be thinner at the edge than older models, with an edge thickness of 5.9 mm (but the same maximum depth). It also includes a dual microphone setup, and includes solid - state drive (SSD) or hard disk storage, or an Apple Fusion Drive, a hybrid of solid state and hard disk drives . This version of iMac was announced in October 2012, with the 21.5 - inch (55 cm) version released in November and the 27 - inch (69 cm) version in December; these were refreshed in September 2013, with new Haswell processors, faster graphics, faster and larger SSD options and 802.11 ac Wi - Fi cards . </P> <P> In October 2014, the seventh major revision of the 27 - inch (69 cm) iMac was announced, whose main feature is a "Retina 5K" display at a resolution of 5120 × 2880 pixels . The new model also includes a new processor, graphics chip, and IO, along with several new storage options . The seventh major revision of the 21.5 - inch (55 cm) iMac was announced in October 2015 . Its main feature is a "Retina 4K" display at a resolution of 4096 × 2304 pixels . It has the same new processor, graphics chip, and IO as the 27 - inch iMac, along with several new storage options . </P>

When did the 27 inch imac come out
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