What's the difference between a flash drive & a drop drive?

What's the difference between a flash drive & a drop drive?

Nothing but the signature! They are both the same!
I believe that flash drive is the generic residence whereas jump drive is Lexar's nomenclature.
They are impossible to tell apart thing.
Nothing...I've also hear them called Thumb Drives and USB Drives.
A hurdle drive is a nickname for a Flash drive. Flash drives are also call pen drives, USB keys, thumb drives and memory sticks [incorrectly as a memory stick is something else]