IP cameras transmit digital video over CAT6/5 networking cable
IP cameras are the easiest cameras to install.
IP cameras use Cat5 or Cat6 network cable for transmitting video. This is the very same cable that is often used when connecting computers to your router or switch. The beauty of using this type of wiring is that video, power and audio can all be transmitted over this one cable. The camera can get power directly from behind your NVR if your NVR has a built in POE power supply or you can use a separate POE switch that also connects to your NVR, This makes installation very easy when compared to coax based systems that need separate wires and cable to transmit power and video.
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Purchasing an NVR with built in POE allows you to simply run a network wire from your camera directly to your recorder to power and transmit video. It's very simple and plug and play.