MP4 = High-quality audio and video at smaller file size; compatible with most devices MP3 = High-quality, compressed audio file developed by Microsoft WAV = Uncompressed, high-resolution audio file WMA = High-resolution, compressed audio file, small file size and high quality MOV = Combines audio and video, offers high-quality at larger file size, works well with TV viewing WMV = Developed by Microsoft, offers good video quality at larger file size, works best with Windows devices