Steve Jobs thought of the idea of the ipad during dinner with a Microsoft employee who boasted of a revolutionary tablet. He became upset and decided to creat a tablet to “show him what a tablet can really be.”
It originally had a songle core cpu and 256MB of ram which was soon overshadowed by the iphone 4
The ipad 2 had a dual core CPU and 512MB of Ram, a camera, and was thinner and lighter form and a retina display(2048x1536 resolution with 264 ppi)
The interface is based around the home screen, a graphical list of available applications. The home screen can be accessed at any time by a hardware button below the screen, closing an open application in the process.
Users can also add and delete icons from the dock, which is the same on every home screen. Each home screen holds up to sixteen icons, and the dock holds up to four icons. Users can delete Web Clips and third-party applications at any time, and may select only certain applications for transfer from iTunes. Apple's default programs, however, may not be removed.
Almost all input is given through the touch screen, which understands complex gestures using multi-touch. The iPad's interaction techniques enable the user to move the content up or down by a touch-drag motion of the finger. For example, zooming in and out of web pages and photos is done by placing two fingers on the screen and spreading them farther apart or bringing them closer together, a gesture known as "pinching".
The Ipad has an app store which has apps developed by developers with a license to develop. However, it has a few applications of its own, such as the Safari Browser, Mail, Photos, Video, Ipod, Itunes, the App store and many more.
Apple's first tablet computer was the Newton MessagePad 100, introduced in 1993, which led to the creation of the ARM6 processor core with Acorn Computers. Apple also developed a prototype PowerBook Duo-based tablet, the PenLite, but decided not to sell it in order to avoid hurting MessagePad sales. Apple released several more Newton-based PDAs; the final one, the MessagePad 2100, was discontinued in 1998. The iPad was announced on January 27, 2010, by Jobs at an Apple press conference at the Yerba Buena Center for the Arts in San Francisco.
There are four physical switches on the 3rd generation iPad, including a home button near the display that returns the user to the home screen, and three plastic switches on the sides: wake/sleep and volume up/down, plus a software-controlled switch whose function varies with software updates. The display responds to other sensors: an ambient light sensor to adjust screen brightness and a 3-axis accelerometer to sense orientation and to switch between portrait and landscape modes. Unlike the iPhone and iPod Touch's built-in applications, which work in three orientations (portrait, landscape-left and landscape-right), the iPad's built-in applications support screen rotation in all four orientations, including upside-down. Consequently, the device has no intrinsic "native" orientation; only the relative position of the home button changes