Normativity concerns the standards of what people should do, believe, or value. It is a quality of rules, judgments, or concepts that prescribe how things should be or what individuals may, must, or must not do. Normative claims express what ought to be the case, such as "you should not smoke". They contrast with descriptive claims about what is the case, such as "you smoked yesterday". Normativity shapes many everyday activities, such as decision-making, evaluating outcomes, criticizing others, and justifying actions.