What is ballet and modern dance?

They are both movement based performing art techniques based on a particular aesthetic. They both evolved over a period of time. They both include both male and female dancers. They both usually use a stage/music/theme when performing. They both require a considerable amount of time to develop the individuals technique. They both express emotions, tell a story, interact with the audience in some way. They both are recognized as different techniques. They both require 'core' strength. They both can create injuries in dancers. They both are enjoyable to watch and perform/learn.