Knowledge
Introduction
Knowledge is a form of awareness or familiarity. It is often understood as awareness of facts or as practical skills, and may also mean familiarity with objects or situations. Knowledge of facts, also called propositional knowledge, is often defined as true belief that is distinct from opinion or guesswork by virtue of justification. While there is wide agreement among philosophers that propositional knowledge is a form of true belief, many controversies in philosophy focus on justification. This includes question like whether justification is needed at all, how to understand it, and whether something else besides it is needed.
Epistemology is the branch of philosophy concerned with knowledge and belief. So epistemology is the study of the nature of knowledge.