MP3 (MPEG Audio Layer III) is a widely used audio coding format for digital audio. It's known for its ability to significantly reduce file size while maintaining acceptable audio quality. This is achieved through lossy compression, which removes audio data that is deemed less perceptible to the human ear. The MP3 format became incredibly popular in the late 1990s and early 2000s due to its efficient compression, making it ideal for storing and sharing music online, especially during the rise of the internet and portable music players. While newer audio codecs offer better compression ratios and audio quality, MP3 remains a ubiquitous format supported by virtually all audio players and devices. Its widespread adoption has made it a standard for digital audio distribution, even though it's not the most efficient or highest-quality option available today. The format's simplicity and compatibility continue to contribute to its enduring popularity.