This chapter introduces the central themes of the book, framing teacher and school resilience as essential for navigating the complexities of an era marked by continuous crises. Rather than viewing resilience as mere individual perseverance, the chapter presents it as a dynamic, multi-dimensional process shaped by personal, professional, and systemic factors. It explores how teachers and schools adapt to uncertainty, sustain their professional identity, and maintain educational quality despite ongoing challenges. By addressing key questions—such as What is the nature of teacher and school resilience? How can it be fostered at the institutional level? What strategies contribute to building resilient educational environments?—the chapter establishes the foundation for a global, research-informed discussion on resilience in education. The chapter highlights the interconnected role of teacher education, school leadership, and policy frameworks in fostering sustainable resilience. The chapter also underscores the urgency of integrating resilience-building strategies into education systems to better prepare teachers and schools for future disruptions.