Service exchange is considered as an integral component of digital platforms. Academic research differentiates between technical, economic, and social platforms, yet scholars face a multitude of diverse platform sub-types being inconsistently utilized. To address that issue and to provide a lexical platform definition overview, this study conducts a systematic scoping literature review on platform types and related concepts in the service domain. The systematic analysis of 49 high-quality service journal articles reveals that numerous digital platform sub-types exist in service research with overlapping definitions. Moreover, several relationship marketing constructs are investigated as central related concepts. This article is the first to explore divergent platform term definitions in the service domain and thus contributes a complementary service science lens on digital platforms alongside IS research.