Un servicio de inteligencia es una agencia gubernamental dedicada a obtener información fundamentándose en la seguridad nacional y la defensa. Existen empresas de inteligencia privadas como Stratfor en Estados Unidos que trabajan con los servicios secretos o servicios de inteligencia de distintos países así como con empresas o particulares que soliciten sus servicios.

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An intelligence agency is a government agency responsible for the collection, analysis, and exploitation of information and intelligence in support of law enforcement, national security, military, and foreign policy objectives. Means of information gathering are both overt and covert and may include espionage, communication interception, cryptanalysis, cooperation with other institutions, and evaluation of public sources. The assembly and propagation of this information is known as intelligence analysis or intelligence assessment. Intelligence agencies can provide the following services for their national governments. \n* provision of analysis in areas relevant to national security; \n* give early warning of impending crises; \n* serve national and international crisis management by helping to discern the intentions of current or potential opponents; \n* inform national defense planning and military operations; \n* protect sensitive information secrets, both of their own sources and activities, and those of other state agencies; \n* may act covertly to influence the outcome of events in favor of national interests, or influence international security; and \n* defense against the efforts of other national intelligence agencies (counter-intelligence). There is a distinction between "security intelligence" and "foreign intelligence". Security intelligence pertains to domestic threats (e.g., terrorism, espionage). Foreign intelligence involves information collection relating to the political, or economic activities of foreign states. Some agencies have been involved in assassination, arms trafficking, coups d'état, and the placement of misinformation (propaganda) as well as other covert operations, in order to support their own or their governments' interests.

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