What is Bioethics? is a book composed of two parts. The first of them is essential for scholars of this discipline since it offers in a concise and rigorous way a history of bioethics, an attempt at a thematic delimitation of it, a rigorous and guiding clarification of the methodological problems of bioethics and a dissertation on the relationship between the latter and philosophy. On the other hand, in the second part, Gilbert Hottois defends the position of extreme liberalism. In its short life (1970 to date), bioethics has given rise to a diversity of positions ranging from the most conservative (almost always religious) that conceive the human being and living beings as unalterable substances, the liberal ones, based on the rational autonomy of people, to extreme liberalism in which bioethics does not defend values, but is a mere "secular discussion procedure" of the problems raised by innovations in science and technology for medicine. G. Hottois sets out this position through his comments on extracts from the work: Fundamentals of Bioethics, by Tristam Engelhardt, convinced that it is in the tolerant discussion of the plurality of points of view expressed without any coercion and with the desire to find a unity, however minimal, that we can live in peace as citizens. Bioethics is thus a procedure of “regulation for peace” in which all the positions mentioned above must be included and both consensus and dissent must be respected.