Surveillance is the monitoring of behavior. Systems surveillance is the process of monitoring the behavior of people, objects or processes within systems for conformity to expected or desired norms in trusted systems for security or social control. Although the word surveillance in French literally means "watching over", the term is often used for all forms of observation or monitoring, not just visual observation. Nevertheless, the all-seeing "eye in the sky" is still a general icon of surveillance. Surveillance in many modern cities and buildings often uses closed-circuit television (CCTV) cameras. Although surveillance can be a useful tool for law enforcement and security companies, many people have concerns about the loss of privacy.