The device features an Apple A4 processor, a 9.7" touchscreen display, and, on certain variants, the capability of accessing cellular networks. Using the iOS operating system, the iPad can play music, send and receive email and browse the web. Other functions, which include the ability to play games and access references, GPS navigation software and social network services can be enabled by downloading apps.
The device was announced and unveiled on January 27, 2010 at a media conference. On April 3, 2010, the Wi-Fi variant of the device was released in the United States, followed by the release of the Wi-Fi + Cellular variant on April 30. On May 28, it was released in Australia, Canada, France, Japan, Italy, Germany, Spain, Switzerland and the United Kingdom.
The device received primarily positive reviews from various technology blogs and publications. Reviewers praised the device for its wide range of capabilities and labelled it as a competitor to laptops and netbooks. Some aspects were criticized, including the closed nature of the operating system and the lack of support for the Adobe Flash multimedia format. During the first 80 days, three million iPads were sold. By the launch of the iPad 2, Apple sold more than 15 million iPads.
On March 2, 2011, Apple announced the iPad 2 and reduced the price of the first-generation iPad.
According to wikipedia