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Siri is a voice recognition application introduced as part of Apple's iPhone 4S. The software can understand natural human language and complete requested tasks, such as answering questions, reading messages, making calendar appointments and setting reminders. It represents Apple's first venture into artificial intelligence (AI) and is considered a groundbreaking technology in the fifth version of Apple's new iPhone, announced in September, 2011.
The technology used by Siri goes back to 1966, when the U.S. Department of Defense recruited SRI International Artificial Intelligence Center International to develop computer capabilities for complex intelligent behavior. Siri, the company, was a startup that commercialized these technologies and was purchased by Apple in 2010.
Siri is expected to act as an additional interface in addition to the more traditional touch screen, mouse, keyboard and gestures and utilizes uses what it knows about a user, such as age, location, likes, dislikes and context. It uses this data to interact with the user more organically. This allows Siri to complete tasks, understand what the user is saying or asking and over time learn about the user to improve functionality.
You could use Siri to speak commands to: