The Xbox One is not backwards compatible with games from earlier Microsoft consoles. Xbox 360 and original Xbox games do not run on the Xbox One, although profile items, such as achievements and avatars, do move to the new console.
Xbox One consoles are not backwards compatible with Xbox 360 games due to incompatible processor architecture between the two consoles. The hardware demands of emulating a system as powerful as the Xbox 360 make it an impractical solution for backwards compatibility. As of 2014, Microsoft has no stated plans to make any form of backwards compatibility available in the future.