What is horton hears a who about

if you mean the moive it is about horton which there is a whole world in the flower he picked from the ground and only he hears them and there is a female kangaroo who tries to destroy it because it is making children pick random flowers and horton tries to travel to a save place for the flower because inside it is a whole new world just in a tiny ball of what seems like dust so he travels long ways but in the end the tiny guys can be heard because horton is trapped and the flower was almost burned but the sound broke into there sky in which the baby kangaroo saves them and they win etc etc yay and credits roll and fin