The technical definition of cosmetology is the study and application of beauty treatment. Branches of specialty including hairstyling, skin care, cosmetics, manicures/pedicures, and electrology. Basically it is all beauty combined into one. A cosmetologist can do it all as to a barber they can just do hair. Cosmetologist can do hair, feet, nails, skin, etc,,, having to do with the hair and beauty. Does that answer your question?