The technical definition of orchestration is execution of a defined workflow: first do A, then B, then C.
Service orchestration represents a single centralized executable business process (the orchestrator) that coordinates the interaction among different services. The orchestrator is responsible for invoking and combining the services.
Useful link: https://kubernetes.io/docs/concepts/overview/what-is-kubernetes/
Service choreography is a global description of the participating services, which is defined by exchange of messages, rules of interaction and agreements between two or more endpoints. Choreography employs a decentralized approach for service composition.
https://stackoverflow.com/questions/4127241/orchestration-vs-choreography