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GLuint VertexArrayID;
glGenVertexArrays(1, &VertexArrayID);
glBindVertexArray(VertexArrayID);

As you can see from the above code, some tutorials use this before using opengl. But a tutorial that I am following, directly uses glGenBuffers method and it works just fine. Hence I am totally confused what glGenVertexArrays. It is sad that it defines how buffer is used, but noone says in what way. Can you help me understand ?

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If you use OpenGL 3.2, it's required.

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