Shaders and Programs - Praise for OpenGL ES 30 Programming Guide - page 75

You might notice that glCreateProgram does not take any arguments; it
simply returns a handle to a new program object. You delete a program
object by using glDeleteProgram .

Void glDeleteProgram (GLuint program )

program

handle to the program object to delete

Once you have a program object created, the next step is to attach shaders
to it. In OpenGL ES 3.0, each program object needs to have one vertex
shader and one fragment shader object attached to it. To attach shaders to
a program, you use glAttachShader .

void glAttachShader (GLuint program , GLuint shader )

program handle to the program object
shader handle to the shader object to attach to the program

This function attaches the shader to the given program. Note that a shader
can be attached at any point—it does not necessarily need to be compiled
or even have source code before being attached to a program. The only
requirement is that every program object must have one and only one
vertex shader and fragment shader object attached to it. In addition to
attaching shaders, you can detach shaders using glDetachShader .

void glDetachShader (GLuint program , GLuint shader )

program handle to the program object
shader handle to the shader object to detach from the program

Once the shaders have been attached (and the shaders have been
successfully compiled), we are finally ready to link the shaders together.
Linking a program object is accomplished using glLinkProgram .

void glLinkProgram (GLuint program )

program

handle to the program object to link