Difference between iterative process and Transaction process

What is the answer.For this question

A developer needs to read data from invoices and then input the extracted data into another system. Each invoice can be processed separately and the order in which they are processed does not matter

Jayakumar S.

The difference or perhaps better said, improvement, of transactional processing over iterative processing is the ability to get and process the data are completely independent.

Thanks for response Wade Henderson, This is one of questions faced during practice exam, i was curious to know, i understand it better than before.