The belief that all morals are dependent on the context. That there is no such thing as objective morality.

Often demonized by conservatives as being responsible for all of the bad things of society today.

The belief that no action is, on its own, good or bad, but that it depends on what it effects.

Does require something to be chosen as a fixed moral belief, so that all others can be deduced from it.

See: moral objectivism