A security guard services (otherwise called a security controller, 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 dangers, (for example, squander, harmed property, dangerous laborer conduct, crime, for example, burglary, and so on) by implementing precaution measures.

Security guard services do this by keeping a high-permeability presence to dissuade unlawful and wrong activities, looking (either straightforwardly, through watches, or in a roundabout way, by observing 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 announcing any episodes to their customers and crisis services, (for example, the police or paramedics), as suitable. Security officials are by and large formally dressed to address their legal power to ensure private property. Security guard services are for the most part represented by lawful guidelines, which set out the prerequisites for qualification (e.g., a criminal record check) and the allowed specialists of a security guard in a given ward. The specialists allowed Security guard services to change by country and subnational locale. Security officials are employed by a scope of associations, including organizations, government divisions, and offices, and not-revenue driven associations e.g., chapels and beneficent associations. Until the 1980s, the term guard was all the more regularly applied to this capacity, a use going back to at any rate the Middle Ages in Europe where there was no type of law implementation other than it is a private issue. This term was extended 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 guard services-based titles. Security officials are in some cases viewed as satisfying a private policing capacity.

A private Security guard services obligation is shielding their customer from an assortment of dangers as a rule as criminal acts. Security staff authorize organization runs and can act to ensure lives and property, and they here and there has a legally binding commitment to give these activities. Notwithstanding essential discouragement, Security guard services are regularly prepared to perform particular undertakings, for example, capture and control including binding and limitations, work crisis hardware, perform medical aid, CPR, take precise notes, compose itemized reports, and perform different errands as needed by the customer they are serving.