The book “Behavioural Economics: Understanding Human Decision-Making” is an exhaustive guide to the fundamental concepts and applications of behavioural economics, with the objective of bridging the divide between conventional economic models and realistic human behaviour. It investigates the ways in which cognitive biases, heuristics, and psychological factors influence economic decisions, thereby contradicting the assumption that individuals always behave rationally. By means of a methodical approach, the book provides readers with a clear awareness of how processes of decision-making are shaped by emotions, social conventions, and risk assessments. The book is divided into ten well thought-out chapters, each of which begins with an overview of the development of economic theory and then on to discuss important topics including social preferences, prospect theory, and temporal preferences. It explores thoroughly the cognitive processes behind basic consumer purchases as well as more difficult financial investments, therefore guiding daily decisions. In the subsequent chapters, the practical applications of behavioural economics in markets, organisations, and public policy are examined, with a particular emphasis on the role of behavioural insights in addressing societal issues. It also offers a comprehensive framework for the development and assessment of behavioural interventions, which encompasses the ethical implications of prompting strategies. The book concludes by exploring the future of behavioural economics, including the integration of technology, experimental methodologies, and emergent research areas. This book gives readers the skills and information they need to comprehend and use behavioural economics in a variety of settings, whether they are studying it for academic credit or working in the field.