MP3s are a popular digital audio format used for storing music and other audio files. The name stands for "MPEG Audio Layer III," which is a type of compression that reduces the file size without significantly affecting sound quality. This makes it easier to store and share music on various devices, such as smartphones, computers, and tablets. Since their introduction in the late 1990s, MP3s have transformed how people listen to music. They allow users to download songs from the internet or transfer them from CDs, making music more accessible. Many music streaming services also use MP3s to deliver audio content to listeners efficiently.