A security guard (or security officer) is a person who is paid to protect property, assets and people. Security guards are usually privately and formally employed personnel. Often, security officers are uniformed and act to protect property by maintaining a high visibility presence to deter illegal and inappropriate actions, observing (either directly, through patrols, or by watching alarm systems or video cameras) for signs of crime, fire or disorder, then taking action and reporting any incidents to their client and emergency services as appropriate.
Since at least the Middle Ages in Europe, the term watchman was more commonly applied to this function. This term was carried over to North America where it was interchangeable with night-watchman until both terms were replaced with the modern security-based titles. Security guards are sometimes regarded as fulfilling a private policing function.
The Security Guard is the person who is guarding and protecting either facility or people. Usually the security guard are working under another company or organization which are dealing mostly with security, but sometime they can be part of the same organization which require the security guard to be there.
Most of the time they are taking care of the order and protecting the facilities from anyone who want to enter to the place without any permission so they will stop the person and ask for the reason before let him or her to enter the place, also sometime they will not allow anyone to enter unless they get the order from the manger or the chief directly then the pass will be granted.
Moreover, the security guard is given the work and orders from the manager or the admin person who is in charge of them to take care of the organization or the building by moving around the place for checking or whatever there is any suspicion thing should be reported or take an immediate action.
In addition, some places require from the security