Say you've got a process that spans a bunch of services and touches the real world. Some ecommerce check out for example.

You need to reserve some inventory, charge a card, eventually email a customer and steps can go wrong. So you have queues, and retries and ways to back things out, undo changes.

To my understanding, Temporal's idea is to factor that part out, the queues and retries, and offsetting actions, so you write the logic and not the workflow orchestration.