"potassium" means the alkali metal potassium, "pyrophosphates" means salts/esters of pyrophosphoric acid (H4P2O7), also known as pyrophosphoric acid.
Tetrapotassium pyrophosphate is a substance used in cosmetic formulations. The substance acts as a buffering substance (regulates and stabilizes the pH of cosmetic products) and as a chelating agent (binds metal ions that could negatively affect the stability and quality of cosmetic products).