Azure Remote Rendering (ARR) is a service that enables you to render high-quality, interactive 3D content in the cloud and stream it in real time to devices, such as the HoloLens 2.
Untethered devices have limited computational power for rendering complex models. For many applications it would be unacceptable, though, to reduce the visual fidelity in any way.
Remote Rendering solves this problem by moving the rendering workload to high-end GPUs in the cloud. A cloud-hosted graphics engine renders the image, encodes it as a video stream, and streams that to the target device.
Source: Azure Docs