What is the difference between professional hair color, and the box kind?

I've heard that boxed hair color isn't so good for your hair (even though the box usually praises the product).





What is the difference between the hair color that the professionals use, and the boxed kind?What is the difference between professional hair color, and the box kind?
professional hair color lasts longer and looks better the box kind washes out even tough they say it wont i does and it could most likely look terrible