In addition to PBCs, you often hear the term microservices in composable commerce. Microserves is a developer concept and is often confused with PBCs.
If a retailer wants to solve a particular business challenge by adding a best-of-breed business capability (PBC), then that composable commerce element will consist of several microservices. Each microservice is developed and designed for a specific purpose, communicating with other microservices over well-defined APIs. Together, the microservices form a coherent functionality to add business value within composable commerce.