Epistemology is a subdivision of Metaphysics along with Ontology. Ontology is about what has Being and Epistemology is about how we know about those things that have Being. But actually this is only true in the Indo-European worldview because other language families do not have anything like Being but instead have things like Existence and Copula separated into different linguistic pieces instead of thrown together into an emergent umbrella concept like Being. Epistemology is thus about the nature of knowledge. Knowledge is very enduring in our experience. Knowledge is usually thought of in terms of concepts in a network that forms a theory that is compared to percepts or information about phenomena. Knowledge is normally thought of as a deeper understanding of some phenomena that is stable across experience. Normally in Science we are trying to establish a body of knowledge which can then be used to do things.