Video Surveillance: This term refers to the use of CCTV and DVR to monitor secure sites, or portions thereof. video surveillance systems can start with a few as one camera. For systems using more than 16 cameras, enterprise video surveillance systems are preferable. The many terms defined in this glossary give an idea of the many options available for different security needs and situations. In todays professional world, video surveillance (often referred to as CCTV) is the most cost effective way to achieve loss prevention.