Simplify the following text for a Grade 9 native English-speaking person.
Original: The primary application for UMD discs is as a storage medium for PSP games , although the format is also used for the storage of motion pictures and , to a lesser degree , television shows for playback on the PSP .
Simplified: The primary use for UMD discs is as a storage medium for PSP games , but the format is also used for the storage of movies or TV shows .