Who am I, and where am I going in life? This book explores the fascinating study of identity development, addressing how people navigate these fundamental questions throughout their lives. In an increasingly complex and globalised world, where choices and information abound, the book provides a comprehensive introduction to the foundations, theories, and applications of identity development, offering readers valuable insights into how we form our understanding of who we are. Readers will gain essential knowledge on identity development, including its foundations, key theories, and methods of measurement, with opportunities to try widely used questionnaires themselves. The book also examines how identity research informs policy and addresses current and emerging topics in the field. By connecting identity development to interpersonal relationships, mental health, career choices, and professional growth, readers will discover how this knowledge can be applied to enhance their understanding of themselves and others. This book is ideal for students in psychology, youth studies, pedagogical science, child study and human development, and family studies programs. It provides an accessible and engaging introduction to identity development, making it a valuable resource for anyone seeking to understand the lifelong process of navigating life paths and making meaningful choices.