Power over Ethernet (POE) is a technology that lets network cables carry electrical power. For example, a Digital Security Camera normally requires 2 connections to be made when it is installed: A network connection, in order to be able to communicate with video recording and display equipment.
Wireless Security Cameras are closed-circuit television (CCTV) Cameras that transmits a video and audio signal to a wireless receive through a radio band. Many wireless security cameras require at least one cable or wire for power: wireless refers to the transmission of video/audio.
Analog cameras turn the video signal into a format that can be received by a television other receiver such as a VCR or monitor. An IP based camera, also known as an IP Network camera, digitizes the video signal using a specialized encoder that contains an onboard web server.