Scholars have recently begun analyzing the topic of ignorance, bringing out intricate and incohesive knowledge in the philosophical literature. Indeed, the so-called Ignorance Studies refer now to those miscellaneous investigations that examine the nature and features of ignorance from various perspectives. Without underestimating these studies' multidisciplinary nature, this work focuses on the philosophical points of view from which ignorance has been analyzed as a stand-alone research topic. The paper is divided into four main parts that describe ethical, epistemological, and cognitive investigations of ignorance. The last part aims at describing emergent and potential follow-ups to current studies.