[Tutor] 'for' loops

[WM.]

I recently asked a question about 'for' loops, expecting them to be 
similar to 'for-next' loops. I have looked at several on-line tutors but 
 am still in the dark about what 'for' loops do.
Does anyone have a plain English about the use of 'for' loops?
Are 'while' loops the only way Python runs a sub-routine over & over?
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