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What is the lock/unlock icon on task list?

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Do you have your phone or a third party app lock certain apps, i.e., when you tappy tap on them, do you need to enter a pin or code?

Thank you. No, it seems a builtin feature in Stock Android, but i do not know what it does mean .
I can lock and unlock each application in the task list but i do not know what i have locked and unlocked then...
I suspect it does mean some "keep in main memory" feature or something like that but i'm not sure in that.
 
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