Apple Inc., formerly Apple Computer, Inc., is an American multinational corporation with a focus on designing and manufacturing consumer electronics and closely related software products. Established in Cupertino, California on April 1, 1976, Apple develops, sells, and supports a series of personal computers, portable media players, mobile phones, computer software, and computer hardware and hardware accessories.
 Wiki articles
Apple articles on this web site include:
- iPad covers the iPad 1 to iPad 4, all standard iPads have a 9.7" screen and beginning with the iPad 3 they all have the same 2048 x 1536 resolution at 264 pixels per inch (ppi)
- iPad Air all iPads from this one on include Wi-Fi dual antennas and MIMO (multiple-input multiple-output) technology.
- iPad Air 2 w/ 9.7" screen
- iPad mini mini 1, 2, 3, 4 w/ 7.9" screen
- iPad 2017
- iPad 2018 adds support for the Apple pencil
- iPad Pro w/ 12.9", 9.7", and 10.5" screen - like other recent iPad these have a 264 ppi screen. They also support the Apple pencil
- iPad Pro 2018
- iPad accessories
Compare iPad models at Apple web site.
- iPod Touch
- iPhone covers 1,3,4,4S,5
- iPhone 5
- iPhone 6 and plus
- iPhone 6S and plus
- iPhone SE
- iPhone 7 and plus
- iPhone 8 and plus
- iPhone X
- iPhone XR
- iPhone XS
- iBooks - App for ePub and PDF
- Mac OS X - includes iOS
- PAGES - covers iOS version.
- FairPlay DRM - used on ePub for iBooks
- PICT a Mac format for vector graphics.
- HEIF is the internal format for the camera starting with iOS 11.0
For comparison of all Apple devices see Wikipedia list of devices