CG C for Graphics – Nvidia
HLSL High Level Shader Language – Microsoft
GLSL OpenGL Shader Language – OpenGL

Shader "Folder/Name"
{
   Properties
   {
      _Color ("Color", Color) = (1.0, 0, 0, 1.0)
   }
   
   SubShader
   {
      Pass
      {
         CGPROGRAM
         
         // pragma
         
         // variables
         
         // structs
         
         // functions
         
         ENDCG
      }  
   }
}