Both M4A and MP3 are audio-only file formats. Although we listen to music, audiobooks or podcasts, on daily bases but most of us are not well familiar with the format of these audios. MP3 and M4A are two kinds of formats which are used commonly in our daily life. Commonly, we have to choose one format for our music, audiobooks, or others. But, we don’t know what are MP3 and M4A?