Native IOS is the Cisco IOS. Hybrid IOS, is used on L3 switches, where you use CatOS on the switch and IOS on the RSM, MSFC or whatever. When you use only IOS to control both L2 and L3 functionality of the switch they call it native IOS.
Ahmed is simply right, and here you are a CCO link demonstrating the difference and how to convert in the case of a Cisco Catalyst 6500, i've done it my self, and i can help you if you are going through a simillar process:
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