In contrast with the compressed audio format, uncompressed audio formats are audio files whose quality remains intact no matter how many times the file had been in further processing. The quality of the resulting file remains unchanged however, they become bulky files that take up considerable space on your storage drive.
When editing raw audio, use this format to retain the original quality of audio as possible. Just export the file into a compressed format if you want a smaller file. Examples of the uncompressed audio formats are WAV and AIFF format.
If you want to have the utmost quality of audio in your music playback, remember that high-quality quality files will not matter if your device cannot achieve recreating high-quality sounds. This only means that you still need to invest in finding good quality headphones and speakers.