If I compress my iTunes library by converting to 'AAC' will the resulting music still be of CD quality or higher?

I apologise if this has been covered elsewhere but I am new here and a bit confused by file formats. Basically all of my music existed as MP3 files of 320kbps on my computer. I imported them all to itunes. I have read that if I use the 'convert to AAC' feature in iTunes I will end up with music of the same quality but save a lot of memory as the AAC files are smaller. Other comments imply that would be a pointless move and that the resulting audio quality will be poorer because I'd be converting 'lossy' to 'lossy'-this doesn't mean anything to me lol.
Basically I want all my music to be of CD quality or better. With that in mind, is it worthwhile me converting all my 320kbps songs to this 'AAC' version or not? If the advantages/disadvantages of this feature could be stated that would also be appreciated!
Thanks

Rob,
Both AAC and MP3 are less than CD quality.  There is no conversion you can do that will raise them to CD quality.  The person who told you it was "pontless" was correct.
If you want CD quality music, you can go back to the original CDs and re-rip using one of the "lossless" formats:  WAV, AIFF, or Apple Lossless.
On the other hand, if your current MP3/320 music sounds good, you may want to leave it alone.  Besides people with audiophile equipment and well-controlled listening conditions, most people do not notice a difference.

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