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2. Closed-circuit television - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television

   Closed-circuit television (CCTV), also known as video surveillance, [1] [2] is the use of closed-circuit television cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly transmitted, though it may employ point-to-point, point-to-multipoint (P2MP), or ...

3. Network video recorder - Wikipedia

   en.wikipedia.org/wiki/Network_Video_Recorder

   A network video recorder (NVR) is a specialized computer system that records video [1] to a disk drive, USB flash drive, memory card, or other mass storage device. An NVR itself contains no cameras, but connects to them through a network, typically as part of an IP video surveillance system. NVRs typically have embedded operating systems.

4. Closed-circuit television camera - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television...

   A closed-circuit television camera is a type of surveillance camera that transmits video signals to a specific set of monitors or video recording devices, rather than broadcasting the video over public airwaves. The term "closed-circuit television" indicates that the video feed is only accessible to a limited number of people or devices with ...

5. Digital video recorder - Wikipedia

   en.wikipedia.org/wiki/Digital_video_recorder

   A digital video recorder (DVR), also referred to as a personal video recorder (PVR) particularly in Canada and British English, is an electronic device that records video in a digital format to a disk drive, USB flash drive, SD memory card, SSD or other local or networked mass storage device. The term includes set-top boxes (STB) with direct to ...

6. IP camera - Wikipedia

   en.wikipedia.org/wiki/IP_camera

   Connection. Ethernet, Wi-Fi. An Internet Protocol camera, or IP camera, is a type of digital video camera that receives control data and sends image data via an IP network. They are commonly used for surveillance, but, unlike analog closed-circuit television (CCTV) cameras, they require no local recording device, only a local area network.

7. Videocassette recorder - Wikipedia

   en.wikipedia.org/wiki/Videocassette_recorder

   A close-up process of how the magnetic tape in a VHS cassette is being pulled from the cassette shell to the head drum of the VCR. A videocassette recorder (VCR) or video recorder is an electromechanical device that records analog audio and analog video from broadcast television or other AV sources and can play back the recording after rewinding.