Epistemology studies the nature of knowledge and the rationality of belief.
'=== History of epistemology ===Epistemology, as a distinct field of inquiry, predates the introduction of the term into the lexicon of philosophy
 The terms originate from the Analytic methods of Aristotle's Organon, and may be roughly defined as follows:A priori knowledge is knowledge that is known independently of experience (that is, it is non-empirical, or arrived at before experience, usually by reason)

