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The iPad is a tablet computer developed by Apple Inc. Announced on January 27, 2010, it is similar in functionality to the iPhone and iPod touch, running the same operating system (iPhone OS) and almost all of the same applications.
The iPad has a larger 9.7-inch (25 cm) LED backlit multi-touch display with a pixel resolution of 1024x768, 16 to 64 gigabytes (GB) of flash memory, a 1-gigahertz (GHz) Apple A4 processor, Bluetooth 2.1, and a 30-pin dock connector to sync with iTunes and connect wired accessories.
Two models have been announced: one with 802.11n Wi-Fi (available in March 2010 worldwide) and one with Wi-Fi, 3G (which can connect to HSDPA cellular networks), and Assisted GPS (available in April in the U.S. and several other countries). Both models may be purchased with three different memory capacities
Optional accessories
Apple will sell several iPad accessories, including:
Keyboard Dock with hardware keyboard, 30-pin connector, and audio jack
Case which can be used to stand the iPad in various positions
Dock with 30-pin connector and audio jack
Dock Connector to VGA Adapter for external monitor or projector
Camera Connection Kit including a USB Type A connector adapter and an SD card reader, for transferring photos and videos
USB Power Adapter with 2A (10W)
Software
Like the iPhone, with which it shares a development environment (iPhone SDK, or software development kit, version 3.2 beta onwards), the iPad will only run software downloaded from Apple's App Store. The iPad will run almost all third-party iPhone applications unmodified (they can be displayed at iPhone size or enlarged to fill the iPad's larger screen); developers can also create apps specifically for the iPad's features.
The iPad will come with the following applications: Safari, Mail, Photos, Video, YouTube, iPod, iTunes Store, App Store, Maps, Notes, Calendar, Contacts, and Spotlight. The iPad syncs with iTunes on a Mac or Windows PC. Apple ported its iWork suite from the Mac to the iPad; the Pages, Numbers, and Keynote applications will be sold in the App Store. Although the iPad is not designed as a cellphone replacement, a user can pair it with a Bluetooth headset and place phone calls using a VoIP application over WiFi or 3G.
The iPad will also include the iBooks application, which displays books and other ePub-format content downloaded from the iBookstore. Currently several major book publishers including: Penguin Books, HarperCollins, Simon & Schuster and Macmillan have committed to publishing books for the iPad