HCL and HF are both ACIDS, with HCL being hydrochloric acid and HF being hydrofluoric acid. Hydrochloric acid is a strong acid that is found in gastric acid and is used in industrial processes such as metal cleaning and pickling. Hydrofluoric acid is a weaker acid than hydrochloric acid and is used in glass etching and semiconductor manufacturing. Both ACIDS are corrosive and can cause serious burns if handled improperly.