Reference video : https://www.youtube.com/watch?v=f4s1h2YETNY

GLSL (OpenGL Shading Language) shaders are programs that run on a computer's graphics processing unit (GPU) to manipulate the rendering pipeline. They allow developers to create custom visual effects and optimize graphics performance in real-time 3D applications.

GLSL shaders come in two main types: vertex shaders and fragment shaders. Vertex shaders manipulate the position and attributes of vertices in 3D space, while fragment shaders determine the color of individual pixels. These shaders work together to create complex visual effects, such as lighting, texturing, and post-processing.

Writing GLSL shaders involves using a C-like programming language with specialized functions and data types designed for graphics operations. Developers can leverage the parallel processing power of GPUs to perform complex calculations on large amounts of data simultaneously, enabling high-performance graphics rendering in games, simulations, and other interactive applications.