How Siri Really WOrks...(http://www.geekculture.com/joyoftech/)

Siri (software)

Siri (pronounced /ˈsɪəri/) is a personal assistant application for iOS. The application uses natural language processing to answer questions, make recommendations, and perform actions by delegating requests to an expanding set of web services. The iOS app is the first public product by its makers,^{[citation needed]} who are focused on artificial intelligence applications. Siri was acquired by Apple Inc. on April 28, 2010.^[1] Before Apple's purchase, Siri had announced that their software would soon be available for BlackBerry and for Android-powered phones, but all development efforts for non-Apple platforms were cancelled after Apple's purchase of Siri.^[2]

Siri's marketing claims include that Siri adapts to the user's individual preferences over time and personalizes results, as well as accomplishing tasks such as making dinner reservations and reserving a cab.^[3]

Siri was launched as an integrated feature, although as a beta version, of the Apple iPhone 4S, launched in October 2011 & currently remains an iPhone 4S exclusive . But some hackers have ported Siri onto the iPhone 4 as well , & they claim that Siri would eventually be available for jailbroken iPhone 4 in near future . ^[4]