Have you visited an exhibition? Social wants are satisfied by law acting which is acting as a social institution. Dworkin argues that law is an " interpretive concept",  that requires judges to find the best fitting and most just solution to a legal dispute, given their constitutional traditions.
If you have travelled by public transport, such as a bus, tram or train, then a fare would have been payable or a bus pass or rail card shown. An agreement to meet up with friends is a form of social rule. Law has its source in the common consciousness Volkgeist of the people.
Yet classification is a matter of form rather than substance, since similar rules often prevail. Roscoe Pound studied the term law and thus came up with his own law definition.
The Law is controlled and enforced by the controlling authority. Kelsen attacked one of its founders, Eugen Ehrlichwho sought to make clear the differences and connections between positive law, which lawyers learn and apply, and other forms of 'law' or social norms that regulate everyday life, generally preventing conflicts from reaching barristers and courts.