Apple's format of music encoding that is perfect in sound quality and while most other encoding formats cause a loss in quality.

Unlike most popular audio formats, the compressed Apple Lossless format doesn’t leave out inaudible and redundant parts of a song in pursuit of a smaller file size. Apple Lossless renders an extremely high-fidelity (and large) audio file.

A high-quality compressed digital audio file format that is approximately half the size of uncompressed files.