As far as I understood OpenGL is a pack of libraries that can be used with pascal and c languages. Where I can download it? Please give me an exact link. Thanks in regards.
http://www.opengl.org/wiki/index.php/Getting_started
Libraries and headers for compilation are usually shipped with compiler. I’m using Visual C++ and I didn’t have to download a thing (except for the driver of course).
If you want to use more advanced features then you need extensions. You either download glext.h and implement everything yourself, or you just use GLEE or GLEW libraries for that.