Earlier Security Setup
Security is always one of major needs for people. During ancient time there were several small states, mostly independent or sometimes under an empire. They had army to protect their citizens from external hazards as well as external invaders. The need for internal security was less important as today due to very less or negligible crime rate.

Current Crime Scenario ? Need for Private Security Agency
Currently crime rate has increased dramatically. Every day, several new instances of crime, theft or terrorism are visible to public. We can see the rate increasing even rapidly than ever. People do not feel themselves secure due to this increasing crime rate. Police and Army is there to protect them from internal as well as external risks, but police personnel is either not enough to control current internal crime rate or not as much interested as they should be. Therefore, people needed some sort of private security personnel. The need gave birth to the idea of private security agencies. These agencies provide security at various levels as well as of various kinds.

Services Provided By Security Agency
Private Security agencies provide security of all kind. They provides personal security in form of private bodyguards, corporate security in terms of providing complete security to a corporation or large firm by employing private security guards to their several business installations. These security agencies also provide events specific security for special or occasional private events like marriages or other social gatherings.
In fact, private security agencies work parallel to government security personnel with their help and support whenever needed. They work in collaboration with Government Security Agency to control law and order too at some occasions.
Security personnel at these private agencies are trained specially for their specific works. They get proper industry training before being employed at their actual place of work. These security guards ensure security of their employers or their assets.