What is the action button Route Task does in Requisition approvers Notification under action button

Summary:

Need to understand what is the functionality of Route task and add assignee in Requisition approvers Notification under action button. Also difference between these two

Content (required):

Need to understand what is the functionality of Route task and add assignee in Requisition approvers Notification under action button. Also difference between these two

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Code Snippet (add any code snippets that support your topic, if applicable):