Trigger Scope - Basically this trigger scope will help to start/resume the action once it met the criteria.
Send & Hotkey Trigger can be used either inside a Trigger Scope activity or by itself within a trigger workflow. When used by itself.
Example: When we need to take a screenshot of site which have 10 Page. We can use Send & Hotkey Trigger to perform the action using human Mouse click/ Keyword Strokes which involves human in loop.
Happy Learning !!