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WhatsApp

WhatsApp is a freeware and cross-platform messaging and Voice over IP(VoIP) service owned by Facebook.The application allows the sending of text messages and voice calls, as well as video calls, images and other media, documents, and user location.
The application runs from a mobile device though it is also accessible from desktop computers; the service requires consumer users to provide a standard cellular mobile number. Originally users could only communicate with other users individually or in groups of individual users.

 WhatsApp was founded in 2009 by Brian Acton and Jan Koum, both former employees of Yahoo!. After Koum and Acton left Yahoo! in September 2007, the duo traveled to South America to take a break from work.At one point, they applied for jobs at Facebook but were rejected.For the rest of the following years Koum relied on his $400,000 savings from Yahoo!.

 In February 2015, WhatsApp introduced a voice calling feature; this helped WhatsApp to attract a completely different segment of the user population.On November 14, 2016, Whatsapp added video calling feature for users across Android, iPhone, and Windows Phone devices.On November 2017,Whatsapp released a new feature that would let its users delete messages sent by mistake within a time frame of 7 minutes.
  • In May 2014, WhatsApp crossed 50 million monthly active users in India, which is also its largest country by the number of monthly active users.
  • In October 2014, WhatsApp crossed 70 million monthly active users in India, which is 10% of its total user base (700 MM).
  • In February 2017, WhatsApp crossed 200 million monthly active users in India.

WhatsApp competes with a number of Asian-based messaging services (that as of 2014, were services like WeChat (468 million active users), Viber (209 million active users) and LINE.
WhatsApp uses a customized version of the open standard Extensible Messaging and Presence Protocol (XMPP). Upon installation, it creates a user account using one's phone number as the username.
WhatsApp software automatically compares all the phone numbers from the device's address book with its central database of WhatsApp users to automatically add contacts to the user's WhatsApp contact list. 

In February 2015, WhatsApp introduced a voice calling feature; this helped WhatsApp to attract a completely different segment of the user population. On November 14, 2016, Whatsapp added video calling feature for users across Android, iPhone, and Windows Phone devices.


In May 2017, it was reported that WhatsApp users spend over 340 million minutes on video calls each day on the app. This is the equivalent of roughly 646 years of video calls per day.As of February 2017, WhatsApp has over 1.2 billion users globally.



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