M4A - What's the Difference?ĪAC, an abbreviation for Advanced Audio Coding, is an alternative to MP3s due to its improved sound quality. So, while there may be other extensions used in AAC format, M4A is one of the most widely used, especially on popular platforms like iTunes. In this AAC vs M4A guide, you will learn more information. The main difference between AAC and M4A is that the former is the encoding system used to compress audio files, and the latter refers to the file extension format itself. The M4A file extension is combined with AAC to represent audio files stored on this encoding system. AAC is an encoding mechanism that creates an enhanced audio experience with a minimal footprint. The problem is that people tend to mix these two formats. You may have several music tracks in your library with any of these formats, and you never noticed before. AAC and M4A are standard audio file formats.
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