AAC (Advanced Audio Coding) is a digital audio compression format that is widely used in the music industry. It is a lossy compression format that is designed to provide high-quality audio at lower bit rates than other formats such as MP3. AAC was developed by the MPEG (Moving Picture Experts Group) and is now widely used in a variety of applications, including digital music players, mobile phones, and streaming services. One company that has embraced AAC is Apple Inc. Apple has been a major proponent of AAC since it was first introduced in 2003. The company has used AAC as the default audio format for its iTunes music store and its iPod digital music players. In fact, Apple was one of the first companies to offer AAC-encoded music for sale online, and it has continued to promote the format as a high-quality alternative to MP3. One of the key advantages of AAC is its ability to provide high-quality audio at lower bit rates than other formats. This means that AAC-encoded music files are smaller than MP3 files of the same quality, which makes them easier to store and transfer. AAC also supports a wide range of bit rates, from 8 kbps to 320 kbps, which allows users to choose the level of quality that best suits their needs. Another advantage of AAC is its support for advanced audio features such as multi-channel audio and variable bit rate encoding. This makes it an ideal format for use in high-end audio systems and professional audio applications. Overall, AAC is a versatile and high-quality audio format that has become a standard in the music industry. Its widespread adoption by companies like Apple has helped to cement its position as a leading digital audio format, and it is likely to remain a popular choice for years to come.