This introductory chapter outlines the conceptual and structural foundations of the book. It highlights the centrality of socioemotional well-being in contemporary organizations and situates it within two major theoretical frameworks: self-determination theory and the job demands–resources model. The chapter proposes an integrative approach that emphasizes their complementarities and introduces the five thematic parts of the volume, each addressing distinct dimensions of well-being in organizational contexts. By combining theoretical reflection with a preview of the chapters, the introduction establishes the conceptual groundwork and outlines the trajectory of the book, positioning socioemotional well-being as both a multidimensional construct and a practical challenge for contemporary workplaces.