Risk is the possibility of something bad happening, [1] comprising a level of uncertainty about the effects and implications of an activity, particularly negative and undesirable consequences. [2][3] Harbor sign warning visitors that use of the walkway is "at your own risk"
Definitions of risk range from narrow definitions - risks to people or machinery resulting from hazards - to wide definitions that see risk as any uncertainty of outcome. The diagram at the top of this article shows how risk can be defined in narrow, medium, and broad ways.