I am going to tell about whatsapp which is the most useful app in all over world . Whatsapp ia a social connector . It is secured and safe .For this all over the people uses the whatsapp . It’s calling system is free and videocalling connect a man who outside the country or state . It is free for every one on google playsotre . For it one person feeling shared whit a personal person or by create a group he shared his feeling with his friends or relatives . The inventor of whatsapp is Jon Koum . He desined the whatsapp for connect all person whom he met . Over all the whatsapp is a best app for connecting his friend or relative who is in the whatsapp.