Truth is most often used to mean being in accord with fact or reality, or fidelity to an original or to a standard or ideal. Truth may also often be used in modern contexts to refer to an idea of "truth to self," or authenticity.The commonly understood opposite of truth is falsehood, which, correspondingly, can also take on a logical, factual, or ethical meaning. The concept of truth is discussed and debated in several contexts, including philosophy, art, and religion.