This book provides a comprehensive examination of Environmental, Social, and Governance (ESG) practices across developed and emerging markets, highlighting how corporations integrate sustainability and ethical governance into business strategy. It explores the evolution of ESG principles, the frameworks that guide disclosure and accountability, and the contrasting realities between mature and developing economies. Through seven well-structured chapters, the book reviews global ESG performance trends, compares regulatory environments, and analyses best corporate practices that drive long-term value creation. It features mini-case studies on top ESG performers such as Novartis, HSBC, Tata Power, and Yili Group, offering insights into cross-sector integration of sustainability in healthcare, finance, energy, and agri-food industries. The discussion also exposes greenwashing incidents and their implications for trust and transparency. Designed for students, researchers, and industry practitioners, this book is an essential reference on corporate sustainability, responsible investment, green finance, and the future of ESG-driven business.