How does Album Art work?


Can someone please give me a simple summary (or point me towards one) of how and where album art is stored.

I'm confused as to the use of hidden AlbumArt jpg files. When I add Album Art using either MP3TAG or iTunes then no hidden system files are generated so is the Album Art now embedded in the file? Are the hidden AlbumArt files a legacy from previous versions of Windows Media Player?


Mp3tag stores the album art in the APIC frame of the ID3v2 tag.