The main concept of whatsapp is free messeging to create a strong social bonding among our friends and family. This app is used by every samartphone user all over world. It has a great and nice layout design which is simple to use. I used this app for last 4 years. This app is free for every smartphone user which makes it more popular.
It gives a lot of features and functions and this is going to updated day by day. The features are improved at last 2-3 years. Now its providing video call as well as it is now easier to calling without delay.
I think whatsapp is very important as uses for sharing of all types of messeges.