Analog cameras record images and then send the signal over a coaxial cable to a DVR (Digital Video Recorder). The DVR converts the video from analog to digital signals, compresses the file, and stores it on a hard drive.
CCTV cameras are a type of security camera that uses an analog video signal to capture video surveillance footage. Analog CCTV cameras are hard wired to surveillance DVRs and monitors using coax cable such as RG59.