Portable music players are electronic devices designed to play audio files, allowing users to listen to music on the go. They come in various forms, including MP3 players, smartphones, and digital audio players. These devices typically store music files and can connect to headphones or speakers for personal listening. Many portable music players support different audio formats and offer features like playlists, radio, and streaming services. Some popular brands include Apple with its iPod series and Sony with its Walkman line. These players have revolutionized how people enjoy music, making it more accessible and convenient.