A Security Officer, is a private person who is paid to protect an organization’s assets (property, people, money, etc.) from various hazards (such as waste, damaged property, unsafe worker behaviour, criminal activity, etc.) by utilizing preventative measures. They do this 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 to minimize damage (example: warning and escorting trespassers off property) and reporting any incidents to their client and emergency services as appropriate.
The training/certificate course for SO covers the above mentioned aspects of security in detail and also provides the theoretical underpinnings for efficient and effective application of various aspects of organizational security.