Context is any information that can be used to characterize the situation of an entity. An entity is a person, place, or object that is considered relevant to the interaction between a user and an application, including the user and applications themselves.
A system is context-aware if it uses context to provide relevant information and/or services to the user, where relevancy depends on the user's task.
Towards a Better Understanding of Context and Context-Awareness -- Anind K. Dey and Gregory D. Abowd (1999)
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