Digital IP Security Cameras have superseded analogue cameras. This is due in part to the vastly improved quality of images they capture with resolutions of 1080p, also they now use PoE (Power over Ethernet) utilising your network infrastructure to power each camera on your domain.
Digital IP Cameras have networking technologies built into them which enables them to act as standalone servers that can be logged into directly from any location worldwide. Under the analogue DVR solution only the DVR offered login capabilities which restricted operators to a single point of reference.
With the vastly improved picture quality of full HD, Digital cameras are now able to clearly display such information as vehicle number plates should an incident need reporting to the authorities. And with the added bonus of PTZ (Pan, Tilt, Zoom) available to some cameras your premise can be monitored just about everywhere.