Version: 2021.3
Writing shaders overview
ShaderLab: defining a Shader object

ShaderLab

ShaderLab is a declarative language that you use in shaderA program that runs on the GPU. More info
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source files. It uses a nested-braces syntax to describe a Shader objectAn instance of the Shader class, a Shader object is container for shader programs and GPU instructions, and information that tells Unity how to use them. Use them with materials to determine the appearance of your scene. More info
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.

There are many things that you can define in ShaderLabUnity’s language for defining the structure of Shader objects. More info
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, but the most common are:

Writing shaders overview
ShaderLab: defining a Shader object