on i-tunes what does convert selection to acc mean?

Question

new i-pod user and all my songs have not been transferring to i-pod

Answer 1

It just means it will turn the songs into the format that i-tunes can understand. It's OK to go ahead and do it. If you're not too sure about it then copy all your songs into a separate folder, then convert them (the originals, not the ones in the new folder) to acc. That way, if you have a problem with it, you have all the originals still unchanged. However, when you do convert them to acc format in i-tunes, it doesn't modify the original files anyway.