<P> As of January 2015, Apple had sold more than 250 million iPads, though sales peaked in 2013 and it is now the second-most popular kind of tablet computer, by sales, after Android - based types . </P> <P> An iPad can shoot video, take photos, play music, and perform Internet functions such as web - browsing and emailing . Other functions--games, reference, GPS navigation, social networking, etc.--can be enabled by downloading and installing apps . As of March 2016, the App Store has more than one million apps for the iPad by Apple and third parties . </P> <P> There have been eight versions of the iPad . The first generation established design precedents, some of which, such as the home button placement, have persisted through all models . The 2nd - generation iPad (iPad 2) introduced a new thinner design, a dual - core Apple A5 processor, and VGA front - facing and 720p rear - facing cameras designed for FaceTime video calling . The third generation added a Retina Display, the new Apple A5X processor with a quad - core graphics processor, a 5 - megapixel camera, HD 1080p video recording, voice dictation, and 4G (LTE). The fourth generation added the Apple A6X processor and replaced the 30 - pin connector with an all - digital Lightning connector . The iPad Air added the Apple A7 processor and the Apple M7 motion coprocessor, and reduced the thickness for the first time since the iPad 2 . The iPad Air 2 added the Apple A8X processor, the Apple M8 motion coprocessor, an 8 - megapixel camera, and the Touch ID fingerprint sensor; and further reduced the thickness . The iPad introduced in 2017 added the Apple A9 processor, while sacrificing some of the improvements the iPad Air 2 introduced in exchange for a lower launch price . </P> <P> There have been four versions of the iPad Mini, all of which have a screen size of 7.9 inches (20 cm). The first generation has similar internal specifications to the iPad 2 but uses the Lightning connector instead . The iPad Mini 2 added the Retina Display, the Apple A7 processor, and the Apple M7 motion coprocessor, closely matching the internal specifications of the iPad Air . The iPad Mini 3 added the Touch ID fingerprint sensor . The iPad Mini 4 features the Apple A8 and the Apple M8 motion coprocessor . </P>

How many versions of the ipad air are there