This book deals with corporate mergers and acquisitions by analyzing the financial and strategic aspects. It starts with a chronological justification of the evolution of external growth operations and ends with case studies in order to put into practice the theoretical contribution of the previous titles. Through this book, we wish to detail the types of mergers and acquisitions, their modes, their motivations, their consequences and their performances. First of all, we propose a panoply of scientific research, methodological explanations and logical structuring to expose a subject of experience considered for a long time as a phenomenon in finance. Then, through a sample of 90 mergers or acquisitions, we analyze the effects of these transactions on French companies.