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TL:DR, Don't worry yourself over it.
So it doesn't have any related with DOTA2?
it's got everything to do with Dota 2, but if you didn't/don't know about OpenGL before then you don't need to look into it now, it's just being used to expand the hardware that can be used to run Dota 2.
The games that run on Windows mostly use DirectX, which is Microsoft's graphics library.
What's a graphics library? Well, here you will get methods and algorithms that can be used to draw 3d objects on screen. games use one or the other graphics library to draw their objects on screen.
So, it's just a different way of doing the same thing that was been done since the beginning.
Since OpenGL is open sourced, developers can submit their own algorithms to make the current methods more efficient, or maybe introduce new methods altogether (of course this has to be approved by opengl), this is far better than a fixed number of employees at Microsoft working to improve Direct X (why? more brains working on something).
For the average gamer, everything works as they used to work for you, you need not worry about it.
For me, one of my favorite games ever was done in OpenGL, thats Doom 3 in 2003. At that time, that game used to be the best looking game ever created. Apply the same logic here, in 2015.
This?