OpenGL ES is the lowest-level API that you use to program 2D and 3D graphics on the iPhone.

If you've used other framework such as Cocos2D, Sparrow, Corona, or Unity, these are all built on top of OpenGL!

One of the reasons why programmers like to use the above frameworks rather than using OpenGL directly is because OpenGL is notoriously difficult to learn.

And that's what this tutorial is for – to make the learning curve a little less steep for beginner OpenGL developers!

In this series, you'll get hands-on experience with OpenGL ES 2.0 and will create a simple "Hello, World" app that displays some simple geometry.

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