Whats an invoice in CS-Cart for?

Does anyone know what is the purpose of the invoice logic in CS-Cart and what data is affected when an order is made an invoice. Is it only an entry to the cscart_order_docs table that just

basically creates an invoice number? The invoice isn't really any different from the order, right?

Dont see much difference myself but we altered ours to show the company reg & vat number. Apart form that the only difference is the stamp INVOICE.


That's what I discovered was not much difference other than the word invoice.