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Determinism is the philosophical belief that all events transpire in virtue of some necessity and are therefore inevitable. Notably, the idea that the past choices of certain rational agents could have been performed differently - or even the idea that the future decisions of such agents could turn out to be other than what they will - is usually challenged under this view. Thus, the "problem" of free will - or the idea of free will as being an "illusion" - often arises as a result of the main claim made by determinism, that is, that the past, present, and future is identified with an essentially unbreakable chain of circumstances of which no single link in such a chain could possibly be avoided. Some determinists deny the idea of "possibility" or "randomness" altogether, even asserting that such ideas are only a creation of the mind or merely the result of imagination. However, addressing free will is its own concern, and any discussion of determinism does not in principle require any discussion of free will. In addition to these issues, the length to which language can actually capture what is exactly at stake, or what the true nature of reality really is in spite of the concept of determinism, is disputed.