This chapter introduces the background and overview of the book. The chapter elaborates on the evolution of ESG practices since its inception. It discusses the academic theories used in ESG-related studies. From the reviews obtained from scholarly literature, the chapter further elaborates on the motivation of listed firms in engaging with ESG. Four aspects were unveiled, and they include firms’ performance, risk management, stakeholder engagement, and future value on firms’ reputation. The chapter then explains how ESG affects firm performance. It provides the impact of ESG on firms in managing their risks. The chapter further outlines firms’ commitment to meeting stakeholders’ expectations on ESG-related issues. This chapter then discusses how ESG practices create future values. It also presents the ESG measurements used in evaluating firms’ ESG-related performances. It discusses the common databases available for extracting ESG scores of listed firms. It then explores the multidimensional screening criteria and methodologies used for generating ESG-related scores in the various databases. This chapter also explains how firms embed ESG into their financing or investment activities. A review of the past literature enabled the chapter to compare and contrast how green-related financing and investment affect the firms differently when compared to brown financing and investment.