Hey Robert,
Flac is a lossless file format. In the music world now, there's a dozen or more filetypes in which music can be made into. Lossless simply means when the file is squished to be smaller, it doesn't lose soundquality. Most lossy filetypes destroy the tunes, man.
Every CD you own is in WAV format. WAV is a full-sized computer file. Nearly every other file type that you will hear about was created to make the music files smaller - in terms of bits & bytes.
Ex: a normal 700mb cd-r can hold hundreds of songs encoded in MP3, but only hold 20 of those same songs if they are in WAV form. Friends do NOT let friends MP3!
Flac became popular a few years ago due to online downloads. Folks could go see a concert, record it with their personal recording devices, encode it to Flac and then let it go online so any & everyone can have it...and it sounded good. Once you download a Flac file though, you have to convert it to a form that either your computer, Ipod or CD player can read. I must have 60 full length concerts stored on my PC becasue the Flac decoding software I have has never worked.
What a lot of this 'file type' stuff boils down to is sound quality & size of the files. Every time someone comes up with a filetype that compresses the music real bad, someone else counters it with a format that tries to do the same, but 'sounds' better. Most of the common file types were NOT developed to sound good however.
In general, i only listen to WAV files...even on my Ipod. However, 320 aac is what i've been listening too in my Imod, and i can't tell a difference yet. My Imod will hold 2000 songs in full on WAV format.
Check out
www.ipodlounge.com or any other other Ipod sites....loads of info regarding difft file types.
if you are a newbie to this, pay it little attention. its a preference thing & not a topic to dwell on too much. Having a computer based music server would be cool though, for sure.
matt