Microsoft revealed plans to allow Xbox 360 games to play on Xbox One via software emulation at E3 2015.
According to the platform holder, digital Xbox 360 titles already purchased via XBLA, as well as retail discs of last-gen titles, will eventually be "natively" playable on Xbox One.
Microsoft executive Mike Ybarra explained that about 100 Xbox 360 titles will be playable on Xbox One by "this holiday," with hundreds more expected to follow. Among the first wave will be the Mass Effect trilogy, Super Meat Boy, Halo Reach, and Perfect Dark Zero.
Ybarra also confirmed that some games could look better when displayed on Xbox One, and in an apparent dig at Sony's PlayStation Now subscription service, said that "we at Microsoft won't charge you to play the games you already own".
Additionally, system-wide Xbox One features, such as DVR and streaming, will be available on all Xbox 360 titles.
Phil Spencer, the head of Xbox, has said the decision to support Xbox 360 games was made to "make 360 owners look at Xbox One as a safe place to play."