There are two types of security: security of physical items or people and data security. The task of both is to ensure the integrity of the protected item, regardless of its type.
The security personnel in charge of protecting a physical thing can also protect a person or an area. These security people (sometimes, women) are risking their lives in order to make sure the target is alive, secure or in one piece.
The bodyguards (personal guards) are used by the majority of the important people (also called VIPs) in various occasions: when they go out shopping, when they go to a club, to various events, concerts or movie premieres. Their role is to make sure that the fans or the reporters do not get too close to the VIP. One can never know when an obsessed fan or person that really doesn't like the star might approach and try to kidnap, injure or even worse, kill him/her. An attempt to kill Monica Seles happened during a tennis game, some more years ago, and the tennis court was considered to be secured.
The bodyguards are very well trained in one-on-one combat, they wear bullet proof gear, but they do not usually wear a gun.
Then, there is the security personnel found in banks, airports, clubs, malls, prisons and buildings hosting several companies. These personnel are highly trained in combat and usually have a permit to wear and use a fire arm. They try to make sure that the personnel and the people going in or out of the place they protect are safe or that they will not try to create any incident.
Probably, the most difficult place to secure is a prison, for that is the place with the most dangerous citizens, and at times, the inmates will rebel against the institution keeping them in. There have been many incidents in which not only the inmates themselves got injured or killed, but members of the security department also.
In a mall, the greatest threat is the shoplifters or those who disturb the other clients by displaying loud behavior. The security has to make sure that these kinds of accidents do not happen. In the club, usually well trained, imposable guys work in order for minors, drunken people, or drug addicts not to get inside. Also, they need to take care of anyone trying to get involved in a fight inside the club.
The security working in the airports around the world need a little bit of help in their efforts to keep everybody safe, as much as possible: they use trained dogs. This personnel use monitoring devices in order to prevent passengers carrying weapons or drugs.
As far as the security of data goes, these professionals need a lot of training and knowledge in the IT area, in order to create solutions or software that will protect a computer from being hacked. These solutions are being used by all kinds of users from big international companies, banks, embassies to civil users. The software created by the hackers is meant to steal important data which will make them rich over night.
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