A mug is a sturdily built type of cup often used for drinking hot beverages, such as coffee, tea, hot chocolate or soup.Mugs have handles and hold a larger amount of fluid than other types of cup.Usually a mug holds approximately 350 mL of liquid; double a tea cup.A mug is a less formal style of drink container and is not usually used in formal place settings, where a teacup or coffee cup is preferred.Shaving mugs can be used to assist in wet shaving.