The Task Actions in SharePoint 2013 Workflows carry a performance of "Wait for task completion" in the process.
It automatically creates a variable named “Variable: Outcome” and log the responses from participants to make corresponding reactions.
To help you understand this process better, there is a similar task process in SharePoint 2010 Workflow you can check via Start Approval Process action > Customization > Change the behavior of a single task.
Please see the image below:
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