Advanced Audio Coding

AAC stands for Advanced Audio Coding. It is a lossy format, which means some sound quality is lost. Apple is largely responsible for bringing AAC to the mainstream, as it is the format used by iTunes and the iTunes Music Store. FairPlay rights management is added to AAC when songs are purchased. But, some advantages for some iPod owners are that it takes less space in your iPod's memory because it is much more smaller than the MP3 format songs.