Together, the two technologies allow for physics-based effects in physics-enabled environments, and have played a part in the development of a multitude of games. They're designed to run on a variety of CPUs and the Xbox One definitely has some real power under the hood.
This gesture is especially surprising given that Microsoft and NVIDIA are now in direct competition what with NVIDIA SHIELD portable gaming console scheduled to hit the market in June. The Xbox One is undoubtedly a powerful console, but will gamers prefer that over the SHIELD, which is a controller with a tiny screen attached to it?
That was a joke.