Now days everyone is using Whats-app to send messages, images, videos, voice messages to their friends and relatives.My friends and relatives are also used Whats app and asks me to open a account in Facebook.
History:-
Whats-app was initially released on 2009 and it was become more popular in 2011.In 2014 Whats-app was acquired by Facebook with 19 billion US dollars.
Service:-
Whats-app is the best app to send messages, videos, images to your friend anywhere with in less time period.Now face book is reached 800 million active users in all over the world.
I always used Whats-app to send SMS to my friends instead of using SMS pack.