All retail purchased Mac OS X discs contain the full and complete OS. The system discs that come with your Mac are also a complete OS. However, these discs can not be used on another Mac of a different model.
Example: A 10. X disc that came with your iMac could not be used to upgrade or install on a MacBook. The install will fail but usually leave your old system intact.
If you are wanting to upgrade you need to purchase the full retail copy. Currently OS X 10.6 Snow Leopard is the current OS sold by Apple. If you had OS X 10.4 you would have to pay $129 to upgrade to 10.6. If you have OS X 10.5 then you would only pay $29 for 10.6. The disc is labeled as an upgrade disc but actually contains the full OS, so if you needed to do a fresh clean install from that disc you can.
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