WhatsApp is know as most popular and trusted social media app in all over the world. It is available in both playstore and iphone app store. We can guess its popularity by seeing million+ downloads in play store. Now a days everyone is using whatsApp. Childrens adults business persons everyone is using whatsApp. WhatsApp is real time messaging app. Desgins and layout is user friendly and easy to use. WhatsApp has many cool features like sharing Doc., Images, Videos as well as free calling and video calling. WhatsApp use end to end encryption which is the most secure way to share personal data.Talking about usefulness, I saw a group of business authorities sharing important informations through whatsApp. Not only business men as well as teachers students are using this app for thier profits. So, overall this app is great.