What is the difference between: shampoo, conditioner and, 2 in 1 shampoo and conditioner?

I would like to know what difference it makes to your hair's look and feel when you only use one of them or use them together.What is the difference between: shampoo, conditioner and, 2 in 1 shampoo and conditioner?
Shampoo is what cleans your hair. It's basically soap for your hair, it removes dirt, oil, sweat etc. However, while cleaning your hair and cleaning it of impurities, it usually drys out your hair at the same time. That's why you need to use a conditioner after you shampoo.





Conditioner is what moisturizes and protects your hair. It makes your hair feel much softer and it also restores some of the moisture that the shampoo has previously cleaned off. Using conditioner on its own will not clean your hair. I have personally used conditioner on its own thinking it was shampoo for a week, and what it did to my hair was that it made it seem like I had really oily hair that wasn't very clean.





2 in 1 shampoos include both shampoo and conditioner, I guess if you would really had dry hair and wanted to use a 2 in 1 shampoo and then a conditioner that would be fine. Although the 2 in 1 shampoo and conditioner, I find is not as effective as doing the shampoo first and then the conditioner on its own.