What Americans call CCTV varies, but most Americans simply say security cameras or surveillance cameras instead of CCTV, though term CCTV is still understood and used in industry. In everyday conversation, Americans say security camera, security system, surveillance camera, or just cameras, for example I have security cameras at my house. In business context, they say surveillance system or security camera system. The term CCTV closed circuit television is considered more technical or British English, in UK people commonly say CCTV, while in US that term is used more by professionals, law enforcement, and in legal documents rather than by general public. Younger Americans might say Ring camera, Nest cam, or Wyze cam referring to specific brands of smart home cameras. For large systems, Americans might say video surveillance or CCTV system interchangeably. So if you ask an American do you have CCTV they will understand but might respond we have security cameras. The technology is same, but naming convention differs, with US preferring security camera as generic term while UK prefers CCTV.
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