The audio is saved in the MPEG-4 format but uses AAC compression - a type of lossless compression - which gives it its excellent audio quality. The M4A file is quite advanced in how it is put together. M4A to MP4 - Convert file now View other audio file formats M4A files had that special combination of not only being smaller than an MP3 file but also better quality which is why they're the audio file type of choice for Apple devices including iPhones and iPods. M4A files are audio files that have been compressed and they were so efficient that they quickly became the go to audio file, especially so after the launch of iTunes which had M4A as its default audio file. M4A files burst onto the scene after Apple decided to develop a rival file format to the popular MP3file.
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