system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: What is the difference between shampoo, shower gel, 2in1 and conditioner?

Title basically says it all. Specifically, though, what makes 2in1 able to do the job of both shampoo and conditioner?
gpt
Shampoo basically reacts with the natural oils and binds so when you rinse, the shampoo takes the oil with it.

Conditioner helps to repair hair damage and basically adds a protective coat to the hair.

AFAIK, two in one doesn't really work at moisturizing the hair.