"Potassium...' means the element potassium, 'undecylenoyl' means undecylenic acid, an unsaturated fatty acid, 'alginate' means the salts/esters of alginic acid, a polysaccharide.
Potassium undecylenoyl alginate is used in cosmetic formulations. The mixture of substances acts as an emulsion stabilizer (supports the formation of emulsions and improves the resistance and durability of emulsions), hair conditioning agent (makes the hair easy to comb, smooth, soft and shiny and gives it volume) and as a skin care product.