Can anyone explain uses of Activity Chaining

Certified Associate Developer

 I knew Activity Chaining is configured when same user have to perform multiple user input tasks without navigating to tasks list .  Can some one let me know where other places we can use Activity chaining and uses of it .Can we stop using Activity chaining in middle of PM where we have Start Process Smart Service (MNI)( the intention of start process smart service is to just trigger another Pm and no data needed from that PM into parent) and then continue after that node?

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