History and Evolution

Before launch: The company had a really simple strategy: They want to put an incredible computer in a book that you can carry around with you and learn how to use in 20 minutes.
Apple's first tablet computer was Newton MessagePad 100 in 1993, they also developed a prototype PowerBook Duo-Based tablet but they didn't sell it.
Apple re-entered the mobile-computing markets in 2007 with the iPhone. In 2009 the iPad's release had been rumored but with other names. The iPad was announced in 2010 by Steve Jobs in San Francisco.
First generation: Apple began taking pre-orders for the iPad form US customers in March 12. The WiFi version went on sale on April 3 and WiFi + 3G version was released on April 30.
The iPad was initially only available online at the Apple store as well as the company's retail locations.
Apple sold more than 15 million first-generation iPads.
Second generation: Jobs unveiled the iPad 2 at March 2, 2011. It has a better processor, it includes front and back camera and it retains the original's 10 hour battery life.
Third generation: This one sports the new dual core processor with quad-core graphics and better resolution. There are 2 models: with WiFi and  WiFi + cellular model.