Compressed audio files are digital sound files that have been reduced in size to save storage space and make them easier to share. This is achieved by removing some audio data that is less noticeable to the human ear, allowing for quicker downloads and less bandwidth usage. Common formats for compressed audio files include MP3, AAC, and OGG. These files maintain a balance between sound quality and file size, making them popular for music streaming services and personal music libraries. While compressed audio files are convenient, they may not capture the full richness of the original recording, which is why some audiophiles prefer uncompressed formats like WAV or FLAC.