Psp downloads are a special feature that the PSP and PSP GO are capable of doing for games, add ons , and expansions. For the original PSP you can download demos and a variety of old PS1 games or even full length PSP games if you have a modded PSP. The PSP GO is strictly download only and you are only able to play games that you download. Older models of the PSP can be modded to play all Playstation games from the PS2, and new PSP games.
Most psp downloads are small in size and you can get them from your PSP, PS3, or from the internet to transfer to a memory stick pro duo card. If you have a larger memory stick, then you can download full length movies as well to watch on the go. Memory sticks have the capacity to come in high storage formats so you can download more and store more on each card. Some people opt to have multiple cards, one for games, one for movies, and others for music. If you have a PSP GO then everything is download only and it comes with a built in hard drive. Wallpapers and photos can even be stored on your memory stick and used in a slideshow or a background.
If you choose to download from the internet then you have the ability to use a computer or the internet on your PSP. Whichever you choose always be sure to use a valid source to minimize the risk of viruses. PSP Downloads are a fun way to add to your PSP collection and you can really get so much more fun out of your console if you download demos and PS1 games.