What is the difference between handmade soap and commercial soap?
Commercial "soaps" aren't actually soap at all. You won't find the term "soap" on commercial soaps because commercial soaps are actually detergents. Commercial Soaps are formulated in a lab with chemicals and synthetic ingredients.
Handmade soaps are made with oils, liquids, and lye. The oils, liquids and lye are mixed during the saponification process and all natural soap is the result.
Commercial soaps remove the Glycerin during their detergent engineering processes and sell the Glycerin for other uses.
Handmade soaps retain Glycerin during the soap making process. Glycerin is a "humectant" which helps draw moisture into the skin.