DVR and NVR surveillance systems use different types of cameras, shaping how each system operates. DVR systems use traditional analog cameras, which have to be connected to the recorder through coaxial cables, creating a reliable but somewhat inflexible surveillance system.
NVR systems, on the other hand, use digital IP cameras, which process digital video and audio signals before transmitting them to the recorder. NVR cameras can be wired (using Ethernet cable) or wireless (transmitting video to the recorder via Wi-Fi). The digital IP cameras also provide higher resolution video than analog cameras, and frequently can offer more advanced features, such as face recognition.