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A voice assistant is a digital assistant that uses voice recognition, language processing algorithms, and voice synthesis to listen to specific commands and perform specific functions as requested by the user. The very first voice activated product was released in 1922 as Radio Rex. The next decade led to amazing progress and research in the speech recognition field, leading most voice recognition devices from understanding a few hundred words to understanding thousands, and slowly making their way into consumers homes. With the release of the iPhone 4s in 2010, Siri was officially released as an integrated voice assistant within iOS. Since then, Siri has made its way to every Apple device available in a single ecosystem.