In the most basic sense, an “activity” is a semantic description of a potential or completed action. In the former case, the activity expresses what can or might be done with a particular object, while in the latter case, it expresses what has already been done. It is the goal of this specification to provide a JSON-based syntax that is sufficient to express metadata about activities in a rich, human-friendly, machine-processable and extensible manner. This may include constructing natural-language descriptions or visual representations about the activity, associating actionable information with various types of objects, communicating or recording activity logs, or delegation of potential actions to other applications. (W3C TR Activity Streams 2.0)


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