An exploration of what we can know about what we don’t know: why ignorance is more than simply a lack of knowledge. In Understanding Ignorance, philosopher Daniel R. Denicola delves into the abundance, endurance, and consequences of ignorance in our society. The book examines various forms of ignorance through the metaphors of ignorance as place, boundary, limit, and horizon. It discusses willful ignorance and the culture that turns ignorance into an ideological stance. Denicola also explores the ethics of ignorance, including the right not to know, and considers whether there are situations where ignorance can be morally good. This insightful work challenges our understanding of what it means to be knowledgeable in the Information Age.