What is the difference between a DL and DLE Flyer?

What is the difference between a DL and DLE Flyer?

Fun Fact: there isn’t one really… A DL flyer is printed 99mm x 210mm – and so is a DLE flyer. But so many people call the flyer a DLE when the correct term is DL. The ‘E’ on the end of DLE actually references the size of the envelope needed to fit the flyer or letter...