16. What is the primary purpose of CCTV cameras according to the text?
17. To monitor employee productivity
18. To track consumer shopping habits
19. To identify citizens for marketing purposes
20. To discourage various types of criminal activities

CCTV cameras primarily serve as a deterrent against criminal activities, acting as a watchful eye that can discourage potential offenders from committing crimes in monitored areas. Their presence creates a sense of security for the community, while also aiding law enforcement in investigations when incidents occur.

In addition to crime prevention, CCTV systems have also evolved to play a vital role in various sectors like traffic management and public safety. By monitoring busy intersections or crowded public spaces, these cameras help ensure swift responses to emergencies or accidents, highlighting their multifaceted usefulness beyond just crime deterrence.