What is culture? Why do cultures change over time? Are there any discernible rules or principles behind culture-related phenomena and processes and, if so, what are they? Familiarity with the most significant cultural theories of the 20th and 21st centuries is vital for anyone studying or researching in the field. This authoritative but concise guide describes these theories and their originators, as well as the links between them and their mutual influences. It explains different ideas in clear and objective fashion and includes approaches that have been unduly neglected, but which have high explanatory value with regard to culture and its phenomena. It will provide readers with an up-to-date idea of what culture is, and how our understanding of it has developed over the past century.