Normal,Green,and blue texture

So,i have been wondering why sometimes when i rip the mesh from some game,it produces the green or blue version of texture.
What is the function of that colored texture? is it important?

You mean this or you are getting a fully green or blue version of this ?

Yes that one

To simulate bumps on the textures so it won’t look flat

What game are we talking about here? Can you post an example of the texture? Because if it is green, it will need converting before being used on source.

I got the normal texture alongside the green and blue version of it
I think blaze has answered my question