Since the update OpenGL standard is not very frequent, therefore, when some popular technology, the graphics card manufacturers in order to support the technology, uses its own extensions to implement this function. However, if different vendors have different implementations, the programming would be an unusually complicated. So multiple vendors to negotiate the use of consistent expansion, which is EXT extension.
If this extension is not only multi-vendor negotiations, and confirmed OpenGL Architecture Review Board (ARB that is), then the extension will become ARB extensions. Finally, if standard-setters believe that it is necessary to add a feature to a new version of the standard, then the extension becomes part of the standard, not an extension.
Using the extended, even low OpenGL version can achieve most high version of the function. When using extension, pay attention to priority, standard> ARB> EXT, that is a standard feature they do not expand, they do not realize there ARB extensions EXT extension
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