The professional role of circularity in industry performance efficiency encompasses a multifaceted approach to resource management, innovation, stakeholder engagement, and operational excellence, all of which contribute to sustainable business practices and enhanced competitiveness. In this vein, the main aim of this book is to interpret circularity and the circular economy through different levels of target companies and industries to disclose the implementable policies and implications. In this regard, the current book tries to investigate the improvement of the circularity concept as an important tool for a sustainable future. According to the aforementioned aim, the different chapters of the present book will focus on the concept of circularity as a solution in ecosystem management, a circular fashion perspective and measuring circularity metrics for target industries, implementation of the digital ecosystem to improve the circularity, integration of smart production with the circular economy, interactions between consumer skepticism and the circular economy, and managerial propositions and legal solutions for improving the adoption of circular business models in example industries.