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X-ray machines 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 checkpoint at the entrance to the Delta Air Lines corporate headquarters in Atlanta

Security is the degree of resistance to, or protection from, harm. It applies to any vulnerable and valuable asset, such as a person, dwelling, community, item, nation, or organization.

As noted by the Institute for Security and Open Methodologies (ISECOM) in the OSSTMM 3, security provides "a form of protection where a separation is created between the assets and the threat." These separations are generically called "controls," and sometimes include changes to the asset or the threat.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Security sections
Intro  Perceived security compared to real security  Categorizing security  Security concepts  Home security  Computer security  Security management in organizations  See also   References    External links   

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