A Product Service-System (PSS) is an integrated combination of products and services that supports a service-led competitive strategy, environmental sustainability, and differentiation from competitors offering lower-priced products. This paper reviews the state-of-the-art of PSS research, analyzing existing literature to define PSS, its origins, features, applications, benefits, barriers, and future research challenges. PSS is a concept that shifts from traditional product ownership to a focus on asset use, offering value through services rather than products. It is particularly relevant for manufacturers in developed economies, as it allows them to enhance competitiveness by reducing total costs and environmental impact. PSS has its origins in Northern Europe, with significant contributions from Scandinavian, Dutch, and Italian researchers. The concept has evolved into three main types: product-oriented, use-oriented, and result-oriented PSS. Applications of PSS include examples such as Rolls-Royce's TotalCare package, which offers a lease-based service for gas turbine engines. Benefits of PSS include economic success, environmental sustainability, and improved customer satisfaction. However, barriers to adoption include cultural resistance, pricing challenges, and organizational changes required to implement PSS. Effective PSS design requires a systemic approach, customer involvement, and changes in organizational structures. Tools and methodologies for designing PSS are available, but they often lack in-depth evaluation. Future research challenges include developing better tools, assessing value, and understanding organizational transitions to PSS. The paper concludes that in-depth and rigorous research is needed to develop models, methods, and theories for PSS, and that better understanding of PSS practices and organizational transitions is essential for its widespread adoption.A Product Service-System (PSS) is an integrated combination of products and services that supports a service-led competitive strategy, environmental sustainability, and differentiation from competitors offering lower-priced products. This paper reviews the state-of-the-art of PSS research, analyzing existing literature to define PSS, its origins, features, applications, benefits, barriers, and future research challenges. PSS is a concept that shifts from traditional product ownership to a focus on asset use, offering value through services rather than products. It is particularly relevant for manufacturers in developed economies, as it allows them to enhance competitiveness by reducing total costs and environmental impact. PSS has its origins in Northern Europe, with significant contributions from Scandinavian, Dutch, and Italian researchers. The concept has evolved into three main types: product-oriented, use-oriented, and result-oriented PSS. Applications of PSS include examples such as Rolls-Royce's TotalCare package, which offers a lease-based service for gas turbine engines. Benefits of PSS include economic success, environmental sustainability, and improved customer satisfaction. However, barriers to adoption include cultural resistance, pricing challenges, and organizational changes required to implement PSS. Effective PSS design requires a systemic approach, customer involvement, and changes in organizational structures. Tools and methodologies for designing PSS are available, but they often lack in-depth evaluation. Future research challenges include developing better tools, assessing value, and understanding organizational transitions to PSS. The paper concludes that in-depth and rigorous research is needed to develop models, methods, and theories for PSS, and that better understanding of PSS practices and organizational transitions is essential for its widespread adoption.