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X-rays and metal detectors are used to control what is allowed to pass through an airport security perimeter
Security spikes protect a gated community in the East End of London

Security means that one is protected against danger or loss. In the general sense, security is similar to safety. The difference between the two is security cares more about dangers from the outside than general safety. Airports and banks usually have lots of security measures. Prison security is mostly designed to keep prisoners from escaping, as well as to keep them from doing anything dangerous to staff or other inmates.

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