Service innovation is crucial for growth in various sectors, including social, organizational, and marketing aspects. The chapter explores different forms of service innovation and how they impact innovation processes. Services are complex social constructs that evolve over time, affecting innovation in tangible and intangible ways. The literature highlights the interactive nature of service innovation and the overlap between service delivery and innovation processes. Overall, research in this area shows a balance between assimilation, demarcation, and integration in service innovation.