what is the difference between VCN and NVR ?

VCN is an all-in-one intelligent video surveillance product that integrates professional storage devices. In addition to basic service functions such as live video surveillance, PTZ control, recording storage, recording backup, mixed storage of video feeds and images, and electronic maps, the VCN also provides multi-level and multi-domain management, local domain stream forwarding, level-by-level stream forwarding, and external domain stream forwarding functions.

NVR (network video recorder) is a specialized computer system that includes a software program that records video in a digitalformat to a disk drive, USB flash drive, SD memory card or other mass storage device. An NVR contains no dedicated video capture hardware.