The non-aggression principle (NAP) is a concept in which "aggression" – defined as initiating or threatening any forceful interference with an individual, their property or their agreements (contracts) – is illegitimate and should be prohibited. Interpretations of the NAP vary, particularly concerning issues like intellectual property, force, and abortion.
The non-aggression principle is considered by some to be a defining principle of libertarianism, especially the principle of antisocialism/propertarianism/laissez-faire capitalism/neoliberalism, and is a central idea of anarcho-capitalism, voluntaryism, and minarchism.[non-primary source needed]