活动 (huó dòng) is a versatile word meaning 'activity' as a noun and 'to organize an event' or 'to hold an activity' as a verb. The character 活 means 'alive' or 'lively', suggesting vitality and engagement, while 动 means 'to move' or 'to act' — together they evoke the idea of purposeful, dynamic action. As a noun, it refers to any planned, organized event or pursuit: sports, cultural events, educational workshops, or even casual gatherings. It’s commonly used in formal and informal contexts alike — from school announcements ('school activities') to community bulletins ('community activities').

As a verb, 活动 is less common in everyday speech but appears in formal or written Chinese, especially when describing the organization or conduct of an event (e.g., 'the association will host a charity activity'). Note that as a verb, it usually requires an object or complement (e.g., 活动一下 means 'to stretch/move one’s body'), but standalone use like '我们今天活动' is rare without context.