Difference between AAC and m4a files, converting from AAC to useable format

Does anyone know the difference between AAC and m4a files? iTunes has an option to use an AAC encoder to compress CD files, but this creates an m4a file not an AAC file. I just got some actual AAC files and iTunes cannot read these, is there a way to convert from AAC to a format that iTunes recognizes? Thanks

iTunes uses AAC data wrapped in an MPEG 4 container file. If you got some *.AAC files, and they're just raw AAC files, then you need to wrap them in an MPEG 4 container. The only way I know to do this is using the foobar 2000 program. You can find more information at http://www.hydrogenaudio.org and http://www.foobar2000.org

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