What does the "MP" stand for in MP3?

The "MP" in MP3 stands for "MPEG Audio Layer-3." It is a type of audio file format that was developed by the Moving Picture Experts Group (MPEG). While the term "Moving Picture" suggests that MP3 is related to videos, it actually refers to the organization responsible for creating various digital audio and video compression standards, including MP3, which is specifically designed for compressing audio data. Therefore, MP3 does not stand for "Moving Picture" but rather for the organization that developed the file format.