Detection is a technical term used to define a successful action taken for physical security. It is like a rescue operation to abort a terror strike; prevent a burglary and stop the intrusion. The process is to detect strangers and note their suspicious activities. The prior information regarding an approaching threat provides some time to get ready to take advance safety measures to protect life, liberty and property of citizens.
Detection improves security. It keeps strangers away from a guarded place. The word guarded place is used for buildings, establishments and places that could be busy streets, residential complexes, business centers and individual homes, offices and shops. An area where advanced security equipment is installed is called a safeguarded place. The good thing is that anyone can turn his home a safe place to live in with the help of security cameras.
There are many ways for detecting suspicious movements, weapons, bombs and other objectionable objects. A metal detector is a good example of a detection device. But you should choose a device according to your needs. A close-circuit-camera is a great detection device for a home. But a metal detector is also needed for strengthening the security of a public place like a railway station and airport.