What does "MP3" stand for in audio formats?

The term "MP3" stands for "Moving Picture Expert Group Layer 3." This designation signifies that MP3 is a digital audio encoding format developed by a working group of ISO/IEC, known as the Moving Picture Experts Group (MPEG). The "Layer 3" refers to the specific layer in the audio compression process that the MP3 format utilizes, which is designed to compress audio data while maintaining sound quality, thereby reducing file size. This makes it particularly suitable for digital music storage and streaming.

The other options present various names that do not correspond to the official definition or purpose of the MP3 format. They do not reflect its origins or technical specifications, which is rooted in audio compression standards set by MPEG. Understanding the correct terminology is essential in grasping the historical and technical context of audio formats used today.