Purpose of some cameras

SECURITY

They’re often mounted in stores or banks to deter theft and record activity without needing a person behind the lens. Think of the reason you might see one in a parking lot at night.

This clue plays on the common use of cameras for monitoring and protection. "Purpose" hints at the reason they’re installed, and "security" is the straightforward answer—many cameras are set up to enhance safety or surveillance. There’s no hidden wordplay here; it’s a direct definition where the answer fits naturally. Think of security cameras in stores or buildings, and the connection becomes obvious.