The Apple iPad 2 does not have Siri. According to Apple's support website, Siri is only available on third generation or later iPads. The program also comes with the iPhone 4S or later, the iPad mini and the fifth generation iPod touch.
Siri is a voice-recognition program that was acquired by Apple in 2010 and has been included in iPhones starting from the 4S generation. Siri functions as a personal assistant and works in tandem with a number of other applications available on Apple devices. The program stores information about an individual user, such as key relationships and regular locations.