<human>:  What are the differences between analog and digital surveillance?
<bot>: The primary difference between analog and digital surveillance is the way that data is captured and processed. Analog surveillance typically uses analog cameras to capture video footage, which is then sent to a VCR or DVR for storage. Digital surveillance, on the other hand, uses digital cameras that may employ closed-circuit television (CCTV) systems, computer networks, and/or the internet to capture, store, and process the video footage. Digital surveillance systems are usually capable of more sophisticated features such as motion detection, facial recognition, and intelligent video analytics.