ALAC, or Apple Lossless Audio Codec, is an audio compression format developed by Apple. It allows users to store music files without losing any audio quality, making it a popular choice for audiophiles and music enthusiasts. ALAC files maintain the original sound quality while reducing file size, which is beneficial for saving storage space on devices. This codec is compatible with various Apple devices, including iPhones, iPads, and Macs, as well as some third-party software and hardware. ALAC supports high-resolution audio, making it suitable for professional audio applications and personal music collections alike.