Full Grain is the actual full leather hide vs the bonded leather previously talked about. Bonded leather doesn't last as well as full grain. I bought some aftermarket Alea seat covers and they claim they are Italian leather. They don't feel like it. I haven't gotten them installed yet either.
As for leather care, I was told the BEST treatment for leather is mink oil. Some cleaners I have bought have it in it, but I was at my local Menards in the cleaning products section and they had leather cleaners and conditioners and actually had mink oil bottles there.