The philosophical interest in the nature, value, and varieties of human understanding has swelled in recent years. This article will provide an overview of new research in the epistemology of understanding, with a particular focus on the following questions: What is understanding and why should we care about it? Is understanding reducible to knowledge? Does it require truth, belief, or justification? Can there be lucky understanding? Does it require 'grasping' or some kind of 'knowhow'? This cluster of questions has largely set the research agenda for the study of understanding in epistemology. This article will conclude by discussing some varieties of understanding and highlight directions for future research.Humans are naturally inquisitive creatures. As Aristotle observed, "All men by nature desire to know." But knowledge is not the only intellectual achievement at which humans aim, and it might not be the most valuable. As Albert Einstein once said, "Any fool can know; the point is to understand." 1 It is widely assumed that understanding is a valuable intellectual achievement; however, the cognitive state of understanding is itself poorly understood. What is understanding? Why is it valuable? And how do we achieve it? These questions are at the forefront of recent work in the epistemology of understanding. In this article, I will attempt to give a sense of the range and depth of this new research on the nature, value, and varieties of human understanding. I will also critically evaluate some of this work. 1 The Aristotle quote is from the opening line of his Metaphysics. The Einstein quote can be found in Christian (1990, p. 207).