Odoo 11 differences between stock move and stock move line

stock.move 
- high level 
- used to model a quantity of products demanded 
- parent location

stock.move.line 
- low level 
- used to model a possible way to meet that demand 
- specific location

Example: You want 10 Widgets for a Transfer. 

The stock.move would show

• 10 units from Stock

There could actually be THREE stock.move.lines that might show

• 5 units from Stock/Shelf A

• 4 units from Stock/Shelf B

• 1 unit from Stock/Shelf C