OpenGL ES versus OpenGL

Question

What are the differences between OpenGL ES and OpenGL ?

Answer 1

OpenGL is 2D and 3D graphics API bringing thousands of applications to a wide variety of computer platform.

OpenGL ES is well-defined subsets of desktop OpenGL.

OpenGL® ES is a royalty-free, cross-platform API for full-function 2D and 3D graphics on embedded systems - including consoles, phones, appliances and vehicles. It consists of well-defined subsets of desktop OpenGL, ...

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P.S.

WebGL shares specification with OpenGL ES, i.e. if you have learned desktop OpenGL, it is simple to learn the others(OpenGL ES, WebGL).