MP3:

MPEG-1 Audio Layer 3, often called MP3, is a popular digital audio encoding and lossy compression format today.

MID:

MIDI is the abbreviation of Music Instrument Digital Interface in English, which translates as "digital musical instrument interface". The so-called MIDI file essentially refers to the data of MIDI information recorded in the computer. The extension of MID file is *.mid. What is the difference between it and another sound waveform file (*.wav file) commonly used in computers? On the surface, both files can produce sound effects or music, but their essences are completely different.

MMF:

Also known as SMAF, it is the abbreviation of Synthetic Music Mobile Application Format. It is designed by Yamaha for multimedia content (programs) used on portable terminals such as mobile phones and PDAs. Specification of data form.

MFM doesn’t know.

Amr

The full names are Adaptive Multi-Rate and Adaptive Multi-Rate Wideband. They are mainly used for audio on mobile devices. The compression ratio is relatively large, but the quality is relatively poor compared to other compression formats. Since it is mostly used for vocals and calls, the effect is still very good.

WMA

The full name of WMA is Windows Media Audio. It is a new audio format launched by Microsoft that is as famous as the MP3 format.

rm

The audio and video compression specification developed by Real Networks is called Real Media.

MIDI is not called an audio format, and I don’t know what it is exactly. But their properties are "MIDI sequence" files.

In fact, as far as I know, MP3 is still the most popular; followed by WMA and rm (RM for video and RA for audio).

If the capacity factor is not taken into account, the sound quality that is most faithful to the original sound is CD and ape.

In terms of the combination of compression ratio and sound quality, that is, cost-effectiveness, it surpasses MP3. As you know, there is only AAC (supported by Korean high-end mobile phones, MP3 and other products).

Others are less popular.

If you want to know more about it, you can check it out.