Can be used in making bath bombs/fizzies but is commonly used in bubble bath and shampoos. 
It can also be used to make solid shamppo bars.

Sodium dodecyl sulfate (SDS) or sodium lauryl sulfate (SLS) sometimes written sodium laurilsulfate, is a synthetic organic compound with the formula CH3(CH2)11SO4Na. It is an anionic surfactant used in many cleaning and hygiene products. 
SDS is a common component of many domestic cleaning, personal hygiene and cosmetic, pharmaceutical, and food products, as well as industrial, commercial cleaning and product formulations.