In philosophy, metaphysics, religion, spirituality, and other contexts, the Absolute is a term for the most real being. The Absolute is conceived as being itself or perhaps the being that transcends and comprehends all other beings.
While there is agreement that there must be some fundamental reality, there is disagreement as to what exactly that might be. For example, some theist philosophers argue that the most real being is a personal God. Some pantheist philosophers argue that the most real being is an impersonal existence, such as reality or awareness. Others (such as perennial philosophers) argue that various similar terms and concepts designate to the same Absolute entity. Atheist, agnostic, and scientific pantheist philosophers might argue that some natural law such as gravity or simply nature itself is the most real being.
The basic concept of the Absolute is that it is the truest reality. However, there are three general ways of conceiving it. The Absolute might be (1) the first and greatest being, (2) not a being at all but the "ground" of being, or (3) both the ground of being and a being.
In conception (1) the Absolute is the most true and intelligible reality. It can be spoken of and known. For example, Georg Wilhelm Friedrich Hegel's Absolute Spirit is the most true reality. It is thinkable, speakable, and exists in objective world by comprehending everything, including people, states, and world history.
In (2) the Absolute might be conceived of as utterly outside of all other reality and hence unintelligible. It cannot be known or spoken about. Plato's Socrates says that "The Form of the Good" is "beyond being", implying that it is even beyond thought, language, and normal categories of existence. St. John of the Cross says:
He who truly arrives there
cuts free from himself;
all that he knew before
now seems worthless,
and his knowledge so soars
that he is left in unknowing
transcending all knowledge.
In (3) the Absolute might be conceived of as transcending duality and distinction. This concept of a fundamental reality that transcends or includes all other reality is usually (but not always) associated with divinity. While this conception initially seems contradictory, it has been highly influential. One way to understand this third conception is to consider the Tao te Ching.