Epistemology is the branch of philosophy that studies knowledge—how we know what we know. It explores questions like, "What is knowledge?" and "How do we acquire it?" By examining the nature and limits of human understanding, epistemology helps us differentiate between belief, opinion, and true knowledge. This field also investigates the sources of knowledge, such as perception, reason, and testimony. For example, when we learn about historical events through books or lectures, we rely on the credibility of those sources. Understanding epistemology can enhance our critical thinking skills and help us navigate the vast amount of information we encounter daily.