WhatsApp application is best application to send and receive messages for me. the concept of whatsapp app is very simple, it is not difficult for me, just install it and make run this application . Layout and design looks attractive to me specially.i like the design more than layout. features of WhatsApp application is easy to understand for me. I am using this from last 3-4 years and it is best for me. there is audio calling, video calling etc facilities for us which is great. yes, it is very useful for me specially guys. I really like this