Security guards are the nursing and guarding service units.

Security guards are service units that care for and guard specific targets.

This sentence is the main purpose of security work. The main duties of security are fire prevention, theft prevention and personal safety in the responsible area. Through the implementation of security personnel's work, ensure the safety, normal working order and public order of the fixed area, and prevent problems before they happen.

The traditional business scope of China's security industry mainly includes guards, guards, patrols, security services for commercial cultural and sports activities, armed escort, road traffic co-management, special security services, security equipment marketing, security consulting, undertaking security projects, establishing security systems, and social security services. Under the background of reform, security service has been extended to new service fields such as property community, primary and secondary schools, large-scale event security, parking lot care, sea and so on.