Audio Interchange File Format (AIFF)
aiff stands for audio interchange file format
Not the same! A song in a commercial CD usually/ normally was stored in an AIFF format. If you imported/ converted this song into an AAC format, then there will be some quality lost. And, if you then export/ convert this song (from AAC format into AIFF), that lost part is never be regained; the later AIFF song is not the same with the first(original) one.
For digital formats, an uncompressed format, such as WAVE or AIFF is best.
AIFF (Audio Interchange File Format) is a lossless audio format known for its high-quality sound reproduction. It supports metadata and can store audio in high resolution. Additionally, AIFF is widely compatible with Mac systems and professional audio software.
wav and aiff
MP3, WAV, AAC, Apple Lossless, MPEG4, AIFF
AIFF means Auto Interchange File Format used in the Apple Macintosh operating system. It is a file for storing audio digital sound data
One advantage of AIFF (Audio Interchange File Format) is its uncompressed audio format, which results in high audio quality without any loss of data. It is commonly used for professional audio recordings and editing due to its ability to maintain audio fidelity.
Wave, AIFF SND and many other formats are not compressed. Most of these are variations of a PCM (pulse code modulation) format.
MP3, AIFF, WAV, MPEG-4, AAC and Apple Lossless (.m4a) including QuickTime's supported files.
The music is stored on a CD as AIFF audio files. If a CD icon appears you can usually double click it and drag the files into your Music folder. AIFF files are relatively large and so are often converted to the MP3 format to save space. A typical song will be around 20MB (AIFF) which will be reduced to around 4MB (MP3). Free software, such as iTunes or numerous others, will recognise the CD and convert the music to MP3s, or whatever format you prefer, and help manage the Music folder.
The iPod can take songs from anywhere if they are in the right format. The supported formats include AAC, MP3, Audible, AIFF, and WAV.