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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 is for avoiding dangers or losses. In general, 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 a lot of security measures. Prison security is mainly to stop prisoners from escaping. It is also to stop prisoners from harming prison employees or other prisoners.

Maximum security is in or around prisons or other types of places where people need to be kept in or kept out. It is the highest security level for a building or area.

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