I dont get the Graphics software

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http://askubuntu.com – I have AMD Radeon HD 4850, with the latest drivers. I just dont get several things, what is x.org? What is FGLRX? Also, what is RandR? And why in the info section of the control centre it says Catalyst version is 12.6, but Catalyst control centre is 2.14, what is the difference between Catalyst and Catalyst control centre? Also, why is the Driver packaging version 8.98 while the Driver package says 12.6? I am extremely confused! As well as in the installer, what is the difference between choosing "Install Driver 8.98 on X.Org 6.9 or later" and "Generate Distribution Specific Driver Package"? (HowTos)