Different types of soap can have different effects on your skin. For example, a bar of soap that contains glycerin will tend to be more moisturising than one that doesn't. Similarly, a soap made with natural ingredients like olive oil or coconut oil will be more gentle and less likely to cause irritation than one made with synthetic ingredients.

The soap testing process can also be classified according to their pH level. A soap with a high pH level (above 10) is considered "alkaline" and can be drying and irritating to the skin. 

On the other hand, a soap with a low pH level (below 5) is considered "acidic" and can be helpful for people with acne or other skin conditions. Soap comes in many different forms, and each type of soap has different benefits for your skin. 

Here are some of the most popular types of soap:

-Glycerin soap: Glycerin soap is made with natural glycerin, which is a humectant that helps to keep your skin hydrated. This type of soap is especially beneficial for people with dry skin.

-Olive oil soap: Olive oil soap is made with natural olive oil, which is an excellent source of antioxidants and vitamins. This type of soap can help to nourish and protect your skin.

– Goat milk soap: Goat milk soap is made with fresh goat milk, which contains high levels of nutrients and vitamins. This type of soap can help to nourish and revitalise your skin.