Unlike commercial discount, it is a discount applied to the entire document, not individually to each product or service that is introduced into the document.
It is a percentage value that applies to the entire document and accrues with the commercial discount that each product or service may have applied.
This type of discount is usually associated with payment terms or rappel volume, which allows the buyer to get one more discount according to the levels reached or the chosen payment term.
Moloni allows you to apply a global discount in a very simple way.
To find out what the commercial discount is, see this FAQ.