“Que sais-je?” (literally "What do I know?") is a series of books published by the Presses universitaires de France (PUF). The aim of the series is to provide the lay reader with an accessible introduction to a field of study written by an expert in the field. As such, they are a good example of haute vulgarisation (high popularization). The sentence "Que sais-je?" is taken from the works of French essayist Michel de Montaigne.