An MP3 player is a portable device designed to play digital audio files, primarily in the MP3 format. These players allow users to store and listen to music, podcasts, and other audio content on the go. They typically feature a user-friendly interface with buttons or touch screens for easy navigation through playlists and songs. Most MP3 players come with built-in storage, which can vary in capacity, allowing users to save thousands of songs. Some models also support additional formats like WAV and AAC. Many MP3 players are lightweight and battery-operated, making them convenient for travel and daily use.