iPad ( EYE-pad) is a line of tablet computers designed, developed and marketed by Apple Inc., which run the iOS and iPadOS mobile operating systems. The first iPad was released on April 3, 2010; the most recent iPad models are the eighth-generation iPad, released on September 18, 2020; the fifth-generation iPad mini, released on March 18, 2019; the third-generation iPad Air, released on March 18, 2019; and the second-generation 11-inch (280 mm) and fourth-generation 12.9-inch (330 mm) iPad Pro, released on March 25, 2020 (different models and generations listed in the sidebar).
As of September 2020, Apple has sold more than 500 million iPads though sales peaked in 2013. It is the most popular tablet computer by sales as of the second quarter of 2020.The user interface is built around the device's multi-touch screen, including a virtual keyboard. All iPads can connect using Wi-Fi; some models also have cellular connectivity. iPads 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 1 million apps for the iPad by Apple and third parties.
There have been ten versions of the iPad. The first generation established design precedents, some of which have persisted through all models. The second generation (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 fifth generation added the Apple A9 processor, while sacrificing some of the improvements the iPad Air 2 introduced in exchange for a lower launch price. The sixth generation has an Apple A10 Fusion processor and Apple Pencil support. The third-generation iPad Air has a 10.5-inch display, Apple A12 Bionic processor, and support Apple Pencil and Apple Smart Keyboard. The seventh generation features a bigger 10.2-inch display with the same Apple A10 Fusion processor and supports Apple Smart Keyboard.
There have been five 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 with the same Apple A7 processor. The iPad Mini 4 features the Apple A8 processor and the Apple M8 motion coprocessor, and an upgraded camera. The fifth generation features the Apple A12 Bionic processor and supports Apple Pencil.
There have been four generations of the iPad Pro. All generations have included a 12.9" screen size option, with the other being 9.7" in first, 10.5" in second, 11" in third and fourth generations.
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