the first volume of the series, we have mapped the journey of the Global economy and Indian economy. Now that we have the context of evolving economic ideas, the second volume of the Economy book on "Sectors of Economy" offers a comprehensive analysis of the various sectors that constitute the economic framework, meticulously examining their roles, interconnections, and impacts. Drawing from a wealth of resources, including “Breaking the Mould” by Raghuram Rajan and Rohit Lamba, alongside Economic Surveys and government reports, it provides a nuanced understanding of economic dynamics. The functioning of the three sectors of the economy determine the shape of the economy as a whole - trends of national income growth, employment, investment patterns and credit flow. This unit will exhaustively cover the significance of each - primary, secondary and tertiary sector, while diving into specific constituent units. Most importantly, we will study these sectors in context of India - the unique patterns and trends, the bottlenecks and the possibilities, with the most updated information seamlessly blended with static knowledge. Moreover, by incorporating data from various government reports, the book contextualises theoretical frameworks within real-world applications. This includes discussions on policy implications for sectors like agriculture, manufacturing, and services, providing a robust foundation for understanding how these sectors contribute to national growth. As such, this book is poised to be a significant resource for students preparing for the UPSC Civil Services Examination (CSE). Its structured content aligns closely with the syllabus, making it an invaluable tool for aspirants. The detailed exploration of economic sectors equips candidates with essential knowledge that can be directly applied in both Preliminary and Mains examinations. Key features include comprehensive coverage with detailed chapters on each sector, analytical frameworks that help students develop critical thinking skills essential for the examination, and regular updates on recent economic developments that keep the content relevant and engaging. Furthermore, our mission to make aspirants "Thinking Creature", emphasises the necessity for aspirants to engage deeply with material rather than relying solely on rote memorisation. This approach encourages students to develop analytical skills by understanding the underlying principles of economic sectors rather than just memorising facts. It also fosters critical thought by encouraging independent thinking, allowing candidates to connect different topics and subject areas effectively.