Information and Meaning is the third book in a trilogy exploring the nature of information, intelligence and meaning. It begins by providing an overview of the first two works of the trilogy, then goes on to consider the meaning of meaning. This explorat ion leads to a theory of how the brain works. This book differs from others in the field, in that it is written from the perspective of a theoretical biologist looking at the evolution of information systems as a basis for studying the phenomena of information, intelligence and meaning. It describes how neurons create a brain which understands information inputs and then is able to operate on such information.