system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does "moisturizing" soap moisturize if the point of soap is to strip oil and dirt from you body?
gpt
It's a trap...

No literally, moisturizing soaps generally use glycerine (also called glycerol) as the moisturizing agent and it leaves a film on your skin which both traps moisture evaporating from your skin and attracts moisture from the air being an hygroscopic chemical.

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Further simplifying, in the soap formulation there is a chemical that both keeps moisture in and pulls moisture from air so your skin remains moist.

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(It's the same reason why sanitizing gel has it, if you used only 70% alcohol your skin would dry really fast but the glycerine that remains on your skin combats that effect and protects your skin)