In computer graphics, a shader is a programmable operation which is applied to data as it moves through the rendering pipeline. Shaders act on data such as vertices and primitives, generate or morph geometries and fragments, and calculate the colors in a rendered image.
"Color Animated fractal ........TendrillonGsr06102006" by SantaRosa OLD SKOOL is licensed under CC BY-SA 2.0 
.
Shadertoy is an online community and platform for computer graphics professionals, academics and enthusiasts who share, learn and experiment with rendering techniques and procedural art through GLSL code. There are more than 52 thousand public contributions as of mid-2021 coming from thousands of users. WebGL allows Shadertoy to access the compute power of the GPU to generate procedural art, animation, models, lighting, state based logic and sound.
"Plastic fractal" by kevin dooley is licensed under CC BY 2.0 .