Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Class of chemical compounds
Diethanolamides are common ingredients used in cosmetics to act as a foaming agents or as emulsifiers. Chemically, they are amides formed from diethanolamine and carboxylic acids, typically fatty acids.
Kritchevsky, J.; Sanders, H. L. (1954). "Foam stabilization by alkylolamides: effect of molecular weight". Primer congrès mondial de la détergence et des produits tensio-actifs. Vol. 1. Paris. pp. 133–136.