Charcoal soap is a type of soap that contains activated charcoal as one of its primary ingredients. Activated charcoal is a form of carbon that has been treated to make it highly porous, which allows it to trap impurities and toxins from the skin. Charcoal soap is often used to help unclog pores and detoxify the skin, making it a popular choice for people with oily or acne-prone skin. It may also contain other natural ingredients like coconut oil or shea butter to help moisturize and nourish the skin.