Copyed from the wiki (cant be arsed to type it)
Digtal media player
The main feature of portable media players is their versatility: being able to load and play different formats of
video, including
MPEG,
DivX,
Xvid,
AMV and
SigmaTel Motion Video (SMV);
audio, including
MP3,
WAV, and
Ogg Vorbis;
digital images, including
BMP,
JPEG, and
GIF; and interactive media, like
flash animations.
Handheld game consoles like
Sony's
PlayStation Portable and the latest
cellphones are usually counted as a PMP, thanks to their playback abilities.
Portable media players typically feature a color
LCD or
OLED screen. Various portable media players include the ability to record video and audio, and some have built-in card readers like
SD or
MMC, which makes it convenient to upload media directly to the player, or the memory is used as extra capacity.
Where as MP3s just play music