This app is a social app developed by Facebook . This app connects us with our family, friends etc. The WhatsApp has many good features with voice calls you can talk to your friends and family for free even if they are far away in another country. And with free video calls you can have face to face conservation for when voice or text just not enough for chat on .WhatsApp allows voice and video calls that use your phone internet connection(data) . It is simple reliable messaging app to be connected with your friends and family . WhatsApp also allows to keep in touch with them in a group and keep conservation on the go. Speak freely with them and share your moments that matter. Now document sharing made more easy on WhatsApp. Well this app is in billon club that is it is downloaded by billon people but those who didn’t downloaded yet they could download this app to keep in touch with your friends and family.