MP3 audio files are a popular digital format used for storing music and other audio content. The name "MP3" stands for MPEG Audio Layer III, which is a standard for compressing audio data. This compression reduces file size while maintaining sound quality, making it easier to store and share music on various devices. MP3 files can be played on a wide range of devices, including smartphones, computers, and portable media players. They are widely used for streaming and downloading music online, allowing users to enjoy their favorite songs without taking up too much storage space.