Movie makeup is a combination of art and science.
It is both corrective, covering flaws and emphasizing attractive features, and creative, enabling actors to inhabit almost any type of character.
Movie makeup that is used to hide pores, wrinkles, and other facial imperfections must withstand close scrutiny when magnified on screen.
Makeup and hairstyles must look natural, but be durable enough to last for long hours under hot lights while actors fight, kiss, and sweat.
Good makeup design requires research, experimentation, and sometimes inventing makeup products or appliances.