I think the difference is how the color is deposited. Cellophanes (Colourshines, but also Jazzing I think-I could be wrong about Jazzing)coat the hair and give it a tint... kinda like how if you wrap a carrot in colored saran wrap it will change the color of the carrot a little - give it a tint.
Other kinds of color (I suspect Adore is like this) deposit color on/in the hair cuticle. That's why you use heat-to lift the cuticle and some of the color gets trapped there, but eventually washes away. Permanent color, penetrates the hair shaft and undergoes a chemical change... (i.e. the dye particles get bigger and become trapped.) so the color can't be removed by simple washing.
Sithembile-I'm not sure what color you would use. My natural hair is a medium-dark brown color. Seems like Tracy gave someone a recommendation a few months ago about a color to use. It was a red, but I think it was Colourshines. I'm kinda new to Adore, so I can't make a rec. Tracy might have an idea of what would be good. Sorry.