What exactly is the purpose behind men's shampoo?

What exactly is the purpose behind mens shampoo?

all my life I thought that hair was just hair at the end of the day, whether it was coming out of a man or a woman's body. therefore I never understood the purpose behind men's shampoo.

I can understand if perhaps men's shampoo are just not scented since this is something we always stay away from.

lets not forget that shaving cream was obviously creator for men to shave our faces but nevertheless women still used them to shave their legs and other body parts and that I know it never harmed them in any way.

What exactly is the purpose behind mens shampoo?
What exactly is the purpose behind men's shampoo?
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