Biztalk Orchestration Interview Question:

Explain me what's the main difference between Call and Start Orchestration?

Submitted by: Muhammad

Calling an orchestration will use the same thread to run another orchestration while using Start Orchestration will create a new thread to run the started orchestration.
A Call Orchestration returns the control back to the caller. A Start Orchestration shape starts the orchestration in a non-deterministic way.
As a conclusion, Calling an Orchestration will be synchronous operation where the caller waits for a response, while Start Orchestration is asynchronous operation.
Submitted by: Muhammad