Epistemology is the philosophical study of knowledge. Without knowledge, scientific enquiry is meaningless and we can't analyse the world around us. But what exactly is it and how do we obtain it? Should we trust our senses? When is belief knowledge? Presuming no prior experience of philosophy, Robert Martin covers everything in the topic from scepticism and induction to Kant's transcendentalism. Clear and readable, this book is essential reading for philosophy students and a much needed introduction to the topic for the general reader.