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Many people engage in surveillance for many purposes.<ref>Lyon, David. 2007. ''Surveillance studies: an overview''. Cambridge: Polity Press.</ref> That purpose may be crime prevention, alerting for attacks, or general gathering of information for a politcal purpose. The results of surveillance are sometimes called "intelligence". Surveillance collects information for police, intelligence agencies, military planners or commercial firms.
Many people engage in surveillance for many purposes.<ref>Lyon, David. 2007. ''Surveillance studies: an overview''. Cambridge: Polity Press.</ref> That purpose may be crime prevention, alerting for attacks, or general gathering of information for a politcal purpose. The results of surveillance are sometimes called "intelligence". Surveillance collects information for police, intelligence agencies, military planners or commercial firms.
This may include observation from a distance by means of electronic equipment (such as [[Closed-circuit television|CCTV]] cameras), or interception of electronically transmitted information (such as [[internet]] traffic or phone calls).
This may include observation from a distance by means of electronic equipment (such as [[Closed-circuit television|CCTV]] cameras), or interception of electronically transmitted information (such as [[internet traffic]] or phone calls).
Surveillance may include simple, relatively low-technology methods such as [[watchtower]]s, human intelligence agents and postal interception. On the other hand, global surveillance is done by [[satellite]] cameras on a daily basis. Such satellites are called "[[reconnaissance]] satellite" or spy satellites.
Surveillance may include simple, relatively low-technology methods such as [[watchtower]]s, human intelligence agents and postal interception. On the other hand, global surveillance is done by [[satellite]] cameras on a daily basis. Such satellites are called "[[reconnaissance]] satellite" or spy satellites.
File:Surveillance video cameras, Gdynia.jpeg|Surveillance video cameras above marina in Gdynia.
File:Surveillance video cameras, Gdynia.jpeg|Surveillance video cameras above marina in Gdynia.
File:Surveillance Camera At Connecticut Avenue, NW & Nebraska Avenue, NW (Washington, DC) (349115665).jpg|Surveillance Camera to support the Washington DC Police
File:Surveillance Camera At Connecticut Avenue, NW & Nebraska Avenue, NW (Washington, DC) (349115665).jpg|Surveillance Camera to support the Washington, DC Police
File:IAO-logo.png|Official seal of the [[Information Awareness Office]] – a U.S. agency which developed technologies for [[mass surveillance]]
File:IAO-logo.png|Official seal of the [[Information Awareness Office]] – a U.S. agency which developed technologies for [[mass surveillance]]
[[Category:Espionage]]
[[Category:Espionage]]
[[Category:Technology]]
[[Category:Security technology]]