Although all Security performs essentially the same function, their specific tasks depend on whether they work in a “static,” or stationary, security position or on a mobile patrol. Security assigned to static security positions usually stay at one location for a specified length of time. They must become closely acquainted with the property and people associated with their station and must often monitor alarms and closed-circuit TV cameras. In contrast, security assigned to mobile patrol drive or walk from one location to another and conduct security checks within an assigned area.
Security personnel working at universities, parks, and sports stadiums perform crowd control, supervise parking and seating, and direct traffic. Security stationed at the entrance to bars and nightclubs prevents access by minors, collects cover charges at the door, maintains order among customers, and protects patrons and property.
Source: U.S. Department of Labor, Bureau of Labor Statistics, Occupational Outlook Handbook