This book examines the historical development and contemporary success of worker and social cooperatives, which constitute a substantial part of the wider cooperative movement, highlighting their contributions across the world to economic, social, and environmental well-being. The authors present 26 case studies in 15 countries showcasing how these cooperatives, prioritizing the cooperativisation of labour by providing membership and control to their worker-member-owners and promoting community empowerment, have built sustainable businesses and fostered democratic decision-making across various sectors and geographies. The analysis emphasizes the importance of education and training, capital accumulation facilitated by supportive regulatory frameworks and inter-cooperative systems (networks, agencies, federations and peer groups), and the role of worker cooperativism in promoting equality, community development, and environmental sustainability. The book further explores the evolving relationship that worker and social cooperatives have had with the trade unions, and their impact on public policy, and concludes by considering the future of worker cooperatives in light of emerging trends such as the commons, community development, and multi-stakeholder models. Worker and social cooperatives are well-positioned to address global challenges by promoting sustainable development, equality, and community-centric solutions. Worker cooperativism has shown a strong capacity to innovate socially, but also technologically, including over the past few years, while providing high levels of employment security and welfare.