Whatsapp is the app which is the most used in the world.Whatsapp is the best massaging app & chat with others securely This app use for personal chat.This look design is pretty good & layout also good.This app update regularly & try to improve.This app feature is massaging, calling & also file send etc.Latest feature is video calling.Its pretty good for users.It has also good function.I am satisfied with the whatsapp application.So over all its very usefull & everyone should use it.
Thank you.