What is the relationship between ActivityInstance and Execution?

What is the relationship between ActivityInstance and Execution ? Please help answer, thanks !

Hello @mrzhangbq ,

please find documentation about this here:

https://docs.camunda.org/manual/latest/user-guide/process-engine/process-engine-concepts/#relation-to-executions

Hope this helps

Jonathan

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Sadly, it doesn’t help. I still cannot understand why do I, as an API user, have to deal with a concept of execution. As far as I understood, it is internal to the engine, right?