Whatsapp is an social media chat application. Now a days crores of peoples uses whatsapp. According to me it is very safe chat application. Because of its privacy policies anyone can not missuse it.
The deasign and layout of whatsapp is too good because it gives user friendly environment that means a non technical person can easily handle it.
it provides very nice smileys, attachment functions such as any one can send an important file within a second, vedio calling, sending vedios etc.
it is very usefull because any important work without any personal computer can be done through whatsapp.
I am mostly using this messanger because I like it so much.