What does a memory stick do for a PSP?

It saves data

for a PSP, a lot how the PS3 does with a hard drive. Since the PSP

is small, SONY used a memory stick to be able to fit in all of the

other parts in it. With a memory stick, you can place in music,

videos, games, etc. on the PSP, unlike Game Boy's, Nintendo DS's,

etc., where they save in their cartridges, which is pretty dumb, so

pretty much, memory sticks allow the PSP to have more features than

all of the other portable systems out so far.