IP Cameras: IP cameras, which are capable of processing video data before passing it to the recorder, are used in NVR systems. IP cameras are usually more durable and can capture and send audio as well as images. IP cameras with advanced hardware enable intelligent video analytics such as licence plate and facial recognition..
NVR recorder: The NVR recorder is only used to store and view video. It doesn't handle video data, which is done before it's transferred to the recorder at the camera.
Audio Support: Because Ethernet cables can transfer audio natively, an NVR system with a camera with a microphone can record audio to the NVR..