WhatsApp (officially WhatsApp Messenger) is an instant messaging (IM) and voice-over-

IP (VoIP) service owned by technology conglomerate Meta.[14] It allows users to send text, voice
messages and video messages,[15] make voice and video calls, and share images, documents,
user locations, and other content.[16][17] WhatsApp's client application runs on mobile devices, and
can be accessed from computers.[18] The service requires a cellular mobile telephone number to
sign up.[19] In January 2018, WhatsApp released a standalone business app called WhatsApp
Business which can communicate with the standard WhatsApp client.[20][21]
The service was created by WhatsApp Inc. of Mountain View, California, which was acquired by
Facebook in February 2014 for approximately US$19.3 billion.[22][23] It became the world's most
popular messaging application by 2015,[24][25] and had more than 2 billion users worldwide by
February 2020.[26] By 2016, it had become the primary means of Internet communication in
regions including Latin America, the Indian subcontinent, and large parts of Europe and Africa.[24]

History

hideWhatsApp Timeline

Feb 24, Jan Koum incorporates WhatsApp in

2009 California.[27]

Aug 2009 WhatsApp 2.0 is released on the App Store for

the iPhone.[28]

Oct 2009 Brian Acton persuades five ex-Yahoo! friends

to invest $250,000 in seed funding, and is

granted co-founder status.[27]

Aug 2010 WhatsApp support for Android OS is added.[29]

Jan 21, WeChat, a messenger app, is founded.[30] It

2011 eventually starts to compete with WhatsApp

and becomes very popular in China.

Apr 2011 In Series A round, WhatsApp founders agree

to take $7 million from Sequoia Capital on top

of their $250,000 seed funding, after months

of negotiation with Sequoia partner Jim Goetz.

May 2011 Snapchat, a competing photo messaging app,

is founded.[31]

Jan 6, 2012 An unknown hacker publishes a website that

makes it possible to change the status of an

number was known.[32][33]

Aug 2012 The WhatsApp support staff announce that

messages were encrypted in the "latest

version" of the WhatsApp software for iOS and

Android (but not BlackBerry, Windows Phone,

and Symbian), without specifying the

cryptographic method.[34]

Feb 2013 WhatsApp's user base grows to about 200

million active users and its staff to 50.[27]

Jul 2013 Sequoia invests another $50 million in Series

B round, valuing WhatsApp at $1.5 billion.[35]

Jul 16, 2013 WhatsApp changes its profit model with an

annual subscription fee of $1 after a free first

year.[36][37]

Aug 2013 Telegram, a cloud-based instant messaging

service, launches.[38]

Aug 2013 WhatsApp introduces voice messaging.[39]

Feb 19, Facebook, Inc. announces its acquisition of

2014 WhatsApp for US$19 billion, its largest

acquisition to date.[40] Facebook pays $4 billion

in cash, $12 billion in Facebook shares, and

an additional $3 billion in restricted stock units

granted to WhatsApp's founders.[41]

Mar 2014 Someone discovers a vulnerability in

WhatsApp encryption on the Android

application that allows another app to access

and read all of a user’s chat conversations

within it.[42]

Nov 2014 WhatsApp introduces Read Receipts, which

show when a message is read by a recipient.

update allowing users to disable this feature.[43]

Jan 21, WhatsApp launches WhatsApp Web, a web

2015 client which can be used through a web

browser by syncing with the mobile device's

connection.[44]

Jan 21, WhatsApp announces its policy on cracking

2015 down on 3rd-party clients, including

WhatsApp+.[45] Users would not be able to use

WhatsApp’s services at all until the third-party

apps are uninstalled.[46]

Dec 2015 WhatsApp is briefly shut down in Brazil after it

refuses to place wiretaps on certain WhatsApp

accounts.[47] It is shut down in Brazil again on

May 2016 and in July 2016.[48]

Jan 18, Jan Koum announces that WhatsApp will no

2016 longer charge its users a $1 annual

subscription fee.[49][50] There is still no clear plan

for monetizing WhatsApp.[51]

Mar 2016 Diego Dzodan, a Facebook executive, is

arrested by Brazilian federal police after

Facebook fails to turn over information from

his WhatsApp messaging account into a

judge's request for a drug trafficking

investigation.[52][53]

Mar 2, 2016 WhatsApp introduces its document-sharing

feature, initially allowing users to share PDF

files with their contacts.[54]

Apr 5, 2016 WhatsApp and Open Whisper

Systems announce that they have added end-

to-end encryption to "every form of

communication" on WhatsApp, and that users

May 10, WhatsApp is introduced for

2016 both Windows and Mac operating systems.[58]

January WhatsApp launches WhatsApp Business, a

2018 platform for small enterprises where they can

connect with customers.[59]

April 2018 WhatsApp co-founder and CEO Jan Koum

announces he’s leaving the company after

clashes with Facebook, saying “I sold my

users’ privacy”.[60]

September WhatsApp launches group audio and video

2018 calls.[61]

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For a chronological guide, see Timeline of WhatsApp.

2009–2014
WhatsApp was founded in February 2009 by Brian Acton and Jan Koum, former employees
of Yahoo! A month earlier, after Koum purchased an iPhone, he and Acton decided to create an
app for the App Store. The idea started off as an app that would display statuses in a phone's
Contacts menu, showing if a person was at work or on a call.[62]
Their discussions often took place at the home of Koum's Russian friend Alex Fishman in West
San Jose. They realized that to take the idea further, they would need an iPhone developer.
Fishman visited RentACoder.com, found Russian developer Igor Solomennikov, and introduced
him to Koum.[62]
Koum named the app WhatsApp to sound like "what's up". On February 24, 2009, he
incorporated[63] WhatsApp Inc. in California. However, when early versions of WhatsApp
kept crashing, Koum considered giving up and looking for a new job. Acton encouraged him to
wait for a "few more months".[62]
In June 2009, when the app had been downloaded by only a handful of Fishman's Russian-
speaking friends, Apple launched push notifications, allowing users to be pinged even when not
using the app.
Koum updated WhatsApp so that everyone in the user's network would be notified when a user's
status changed. This new facility, to Koum's surprise, was used by users to ping "each other with
jokey custom statuses like, 'I woke up late' or 'I'm on my way.'"[62]
Fishman said "At some point it sort of became instant messaging".[62]
WhatsApp 2.0, released for iPhone in August 2009, featured a purpose-designed messaging
component; the number of active users suddenly increased to 250,000.
Although Acton was working on another startup idea, he decided to join the company.[27] In
October 2009, Acton persuaded five former friends at Yahoo! to invest $250,000 in seed funding,
and Acton became a co-founder and was given a stake. He officially joined WhatsApp on
November 1.[27] Koum then hired a friend in Los Angeles, Chris Peiffer, to develop
a BlackBerry version, which arrived two months later.[27] Subsequently, WhatsApp for Symbian
OS was added in May 2010, and for Android OS in August 2010.[64] In 2010 Google made
multiple acquisition offers for WhatsApp, which were all declined.[65]
To cover the cost of sending verification texts to users, WhatsApp was changed from a free
service to a paid one. In December 2009, the ability to send photos was added to the iOS
version. By early 2011, WhatsApp was one of the top 20 apps in the U.S. Apple App Store.[27]
In April 2011, Sequoia Capital invested about $8 million for more than 15% of the company, after
months of negotiation by Sequoia partner Jim Goetz.[66][67][68]
By February 2013, WhatsApp had about 200 million active users and 50 staff members. Sequoia
invested another $50 million, and WhatsApp was valued at $1.5 billion.[27] Some time in
2013[69] WhatsApp acquired Santa Clara-based startup SkyMobius, the developers of Vtok,[70] a
video and voice calling app.[71]
In a December 2013 blog post, WhatsApp claimed that 400 million active users used the service
each month.[72] The year 2013 ended with $148 million in expenses, of which $138 million in
losses.[73]