This is very popular app in all world.
and every smart-phone user use it.
it is very nice app. it is easy to use. in this app many feature like as image, video, document, audio, text sharing center. it is very usefull in human life. it is very very nice app. every one know it. whats app is one part in human life.
through watsapp bussness work is very fast. I like it.
it most use for messeging. it is very useful for college student.