Cortana is an intelligent personal assistant created by Microsoft for Windows Phone 8.1 (where it now supersedes Bing Mobile), Microsoft Band, Windows 10, and coming to iOS, Android, and the Xbox One.
Cortana was demonstrated for the first time at the Microsoft BUILD Developer Conference (April 2–4, 2014) in San Francisco. It has been launched as a key ingredient of Microsoft’s planned “makeover” of the future operating systems for Windows Phone and Windows. It is named after Cortana, a synthetic intelligence character in Microsoft’s Halo video game franchise originating in Bungie folklore, with Jen Taylor, the character’s voice actress, returning to voice the personal assistant’s US-specific version.
As of 2015, Cortana is available as a beta to all users of Windows Phone 8.1 in the United States (US English), China (Mandarin Chinese), and the United Kingdom (UK English). Users in certain countries can also choose to opt-in to the alpha for the English, French, German, Italian, and Spanish versions of Cortana on Windows Phone as of August 2014. In most of these regions, Cortana is also available via Windows Insider to both PC and mobile preview users of Windows 10.
Cortana is your clever new personal assistant.
Cortana will help you find things on your PC, manage your calendar, track packages, find files, chat with you, and tell jokes. The more you use Cortana, the more personalized your experience will be.
To get started, type a question in the search box on the taskbar. Or select the microphone icon and talk to Cortana. (Typing works for all types of PCs, but you need a mic to talk.)
Source : microsoft