system
Given the following post, respond as if you're commenting on Reddit:
human
What does conditioner (for your hair) actually do? And how does it do it?

And does it still do it if it's in that shampoo/conditioner combo stuff?
gpt
Shampoo's main goal is cleaning hair.  During the cleaning process a lot of the natural oils are stripped from hair.  Conditioners add back things like oils to undo some of the less-desirable effects of Shampoo.

Fun Fact: modern chemistry has managed to merge shampoo and conditioner pretty well into one product.  Some still believe that separate products are needed, but others are fine with a combined product.