What does tinting your eyebrows mean? and how does it happen?

You can tint your eyebrows with hair dye. I don't recommend doing this yourself since people have gone blind by doing it wrong.. go to the salon!What does tinting your eyebrows mean? and how does it happen?
Well, its just when people want to darken or lighten their eyebrows, wich you just go to a make-up store and ask for a shade that will suit you, and basically you might want to use a tinting pencil, its just like a pencil that you brush over your eyebrows and it darkens or lightens them, so its basically make-up for your eyebrows??