ppm means pages per minute or how many pages it can print per minute.
A4 is a paper size.
draft and normal are quality settings.
dpi (dots per inch) is basically the resolution it can print, kinda like the resolution on your screen. the higher the number the better the quality.
a flatbed scanner is one you put the paper on, then scan.
watts is the power usage.
if there is anything I missed let me know.
What do you need the printer for?