A security guard services (otherwise called a security overseer, security official, or defensive specialist) is an individual utilized by an administration or private gathering to ensure the utilizing gathering's resources (property, individuals, hardware, cash, and so on) from an assortment of risks, (for example, squander, harmed property, dangerous laborer conduct, crime, for example, burglary, and so forth) by authorizing deterrent measures. Security guard services do this by keeping a high-permeability presence to prevent unlawful and wrong activities, looking (either straightforwardly, through watches, or by implication, by checking caution frameworks or video observation cameras) for indications of wrongdoing or different perils, (for example, a fire), making a move to limit harm, (for example, notice and accompanying intruders off property), and detailing any episodes to their customers and crisis administrations, (for example, the police or paramedics), as suitable.

Security officials are by and large formally dressed to speak to their legitimate power to ensure private property. Security guards are by and large represented by legitimate guidelines, which set out the prerequisites for qualification (e.g., a criminal record check) and the allowed specialists of a security gurard service in a given ward. The specialists allowed to security guards shift by country and subnational locale. Security officials are employed by a scope of associations, including organizations, government offices, and offices, and not-revenue driven associations (e.g., places of worship and magnanimous associations).

Until the 1980s, the term gatekeeper was all the more usually applied to this capacity, a use going back to at any rate the Medieval times in Europe where there. This term was continued to North America where it was tradable with night-gatekeeper (e.g., security guard services) until the two terms were supplanted with the cutting edge security-based titles. Security officials are of the time viewed as satisfying a private policing capacity. Numerous security firms and restrictive security guard services divisions practice the "recognize, prevent, notice and report" technique. Security officials are not needed to make captures, however, have the position to make a resident's capture, or in any case go about as a specialist of law implementation.