These different types of lighting create different gradients and colours of light giving an image more meaning and depth. The way the light is enables the image to be more interesting and direct to what you want for your shoot.
I wanted to pin this photo to see a professional set up for using lighting gels. Here there is technology used including a stand with the lighting gel over the light which is being bounced onto a stand with lines in to created shadow on the model.
Artem Medvedev Although this piece is more centered around the art theme of color, the lines in the picture are also essential. What attracted me to this piece was how the lines divided the woman's face with different pops of color.