OpenGL is a collection of api calls that move buffer data around. It is an api for interacting with shaders compiled into a program. This is all done in 2D, 3

OpenGL is a collection of api calls that move buffer data around. It is an api for interacting with shaders compiled into a program. This is all done in 2D, 3D, and even 4D. The rendered product is a screen which only has 2 dimensions, but calling it 2D is a huge oversimplification.