Hey friends.i am riya gupta. About whatsapp I must say it is now a days very popular among youngsters. As it is free to download this app for smartphones. It uses the internet to send messages, images, audios as well as videos. I think its everything a person wants in an app. Although, the best thing about whatsapp is that it is very similar to text messaging services, however, because whatsapp uses the internet to send messages, the cost of which is significantly less than texting.