In What is Truth? Thomas Aquinas examines the essence of truth through an accessible analysis of the medieval philosopher's De Veritate. Aquinas raises fundamental questions, beginning with the crucial question "what is something?" and reflects on the implications of this inquiry for our understanding of knowledge and reality.The book attempts to reveal how our first notions and contents of thought are intertwined with the apprehension of reality, suggesting that the search for the essence of things is fundamental to acquiring knowledge. Throughout this work, four of Thomas's central ideas about truth are presented, each offering a unique and stimulating perspective for understanding his philosophy.This text is designed for the curious and students of philosophy, inviting readers to explore deep questions that Thomas Aquinas himself asks. I hope it is an ideal read for those interested in the nature of knowledge and truth, highlighting the relevance of these questions in today's philosophical context.