Security cameras, also known as surveillance cameras, are used to monitor homes, businesses, and other types of properties. Typically, they are connected to a recording device such as a tape recorder or a disk. In the last few years, IP-based security cameras have become increasingly popular. Security cameras enable you to remotely monitor a scene and play back recorded images.
Analog Closed-Circuit Television cameras record pictures or videos as analog signals. Most of old surveillance cameras are analog cameras. This type of camera records directly onto a video tape recorder. In order to save recordings to a PC, the analog signal must be converted to a digital format; this can be done with a video capture card.