Epistemology analysis of the nature of knowledge, how we know, what we can and cannot know, and how we can know that there are things we know we cannot know.
The subject of Epistemology is incorporated into the International Baccalaureate program, in the Theory Of Knowledge subject.
Traditional View of Knowledge
Philisophical tradition going back as far as Plato characterises a proposition as known where it is, at a minimum:
2) That belief is "justified" and
3) it is true.
Most modern epistemology concerns itself with two problems, the adequacy of that definition and analysis of what it means for a belief to be "justified".