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Security or safety is being free from danger, i.e. it is impossible that something very bad will happen. In absolute sense this is hardly possible, it is a relative matter. The term can be used with reference to crime, accidents of all kinds, etc.

In finance, a security is an instrument traded in the financial markets. See Securities.

In private security, security is the result of services provided to prevent, deter, detect and/or document crime, fire, disorder or violations of company rules. These services may be provided by a security guard or by alarms, security cameras, or as a routine part of the performance of every employee's duties (especially in smaller companies).

Compare with: National security

In telecommunication, the term security has the following meanings:

Sources: from Federal Standard 1037C and adapted from the Department of Defense Dictionary of Military and Associated Terms and from the Department of Defense Dictionary of Military and Associated Terms

Proposed alternative definition:

In American football, a safety is the act by which one team gains two points when an opponent possessing the ball is tackled in his own end zone, or runs out of bounds in his own end zone.

See also classified information, insecurity, information security, computer security, hacking, cracking, phreaking.

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