The original codename for the Xbox One was Durango. Microsoft used the name internally during development before formally announcing the console as Xbox One in May 2013.
The console followed the Xbox 360 and was designed as an entertainment system as well as a gaming machine. Its reveal emphasized television integration, voice control, cloud services, and the Kinect sensor, although the company later changed several policies before launch after strong public criticism.
Durango is often confused with other Xbox project names. “Project Natal” was the development name for the motion-sensing technology that became Kinect, while “Project Scorpio” was the codename for the Xbox One X. These names describe different products or initiatives, so Durango specifically identifies the development project that became the original Xbox One.