The concept of whatsapp is very easy and the awesome new feature is video calling which make is really really good app .
the design and layout of whatsapp is good looking not very color full not very light so it is good
there are many fetures in new updated whatsapp like gif, video calling, etc
it was very use full for those people which have contact to those people which doen’t have sim but have mobile
but now every body start to use so it will very usefull for every person