Whatsapp is best messenger . It change the System of Communication . Befour Whatsapp You can send SMS in Some Words. But now You can send special vedios, Photos, Long Text, PDF, Audio, voice Etc.
By whatsapp only.
In Whatsapp we creat groop of persions, For different purpuse.
Now you can vedio chat to your contact persion.
Whatsapp is a Combo of all Systems of communication.