OpenGL Shading Language (GLSL), is a high-levelshading language with a syntax based on the C programming language. It was created by the OpenGL ARB (OpenGL Architecture Review Board) to give developers more direct control of the graphics pipeline without having to use ARB assembly language or hardware-specific languages.
We can create awesome 3D effects by this language.
If you work on After Effects or Premiere Pro, please learn this language.