WhatsApp

WhatsApp MessengerWhatsApp Inc.social mediaWhat's AppWhatsApp, Inc.
WhatsApp Messenger is a freeware, cross-platform messaging and Voice over IP (VoIP) service owned by Facebook, Inc.wikipedia
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Voice over IP

VoIPVoice over Internet Protocolvoice-over-IP
WhatsApp Messenger is a freeware, cross-platform messaging and Voice over IP (VoIP) service owned by Facebook, Inc. It allows users to send text messages and voice messages, make voice and video calls, and share images, documents, user locations, and other media. The hack, allegedly developed by Israeli surveillance technology firm NSO Group, injected malware onto WhatsApp users’ phones via a remote-exploit bug in the app's Voice over IP calling functions.
Popular codecs include the MDCT-based AAC-LD (used in FaceTime), the LPC/MDCT-based Opus (used in WhatsApp), the LPC-based SILK (used in Skype), μ-law and A-law versions of G.711, G.722, and an open source voice codec known as iLBC, a codec that uses only 8 kbit/s each way called G.729.

Messaging apps

messaging appsocial messagingmessaging
WhatsApp Messenger is a freeware, cross-platform messaging and Voice over IP (VoIP) service owned by Facebook, Inc. It allows users to send text messages and voice messages, make voice and video calls, and share images, documents, user locations, and other media.
Some examples of popular messaging apps include WhatsApp, China's WeChat and QQ Messenger, Viber, Line, Snapchat, Korea's KakaoTalk, Google Hangouts, Blackberry Messenger, Signal, Telegram, and Vietnam's Zalo.

Facebook, Inc.

FacebookFacebook Inc.Facebook Inc
WhatsApp Messenger is a freeware, cross-platform messaging and Voice over IP (VoIP) service owned by Facebook, Inc. It allows users to send text messages and voice messages, make voice and video calls, and share images, documents, user locations, and other media.
It acquired Instagram, WhatsApp, Oculus, and GrokStyle and independently developed Facebook Messenger, Facebook Watch, and Facebook Portal.

Jan Koum

Jan B. Koum
WhatsApp was founded in 2009 by Brian Acton and Jan Koum, former employees of Yahoo!.
He is the co-founder and was the CEO of WhatsApp, a mobile messaging application which was acquired by Facebook Inc. in February 2014 for US$19.3 billion.

Text messaging

text messagetextingtext messages
WhatsApp Messenger is a freeware, cross-platform messaging and Voice over IP (VoIP) service owned by Facebook, Inc. It allows users to send text messages and voice messages, make voice and video calls, and share images, documents, user locations, and other media.
Services such as Facebook Messenger, Snapchat, WhatsApp and Viber have led to a decline in the use of SMS in parts of the world.

Jim Goetz

In April 2011, Sequoia Capital invested about $8 million for more than 15% of the company, after months of negotiation with Sequoia partner Jim Goetz.
Goetz is known for his focus on mobile and enterprise startups, including successful investments in AdMob, WhatsApp, Chartboost and GitHub.

Brian Acton

WhatsApp was founded in 2009 by Brian Acton and Jan Koum, former employees of Yahoo!.
He was formerly employed at Yahoo!, and co-founded (with Jan Koum) WhatsApp, a mobile messaging application which was acquired by Facebook in February 2014 for US$19 billion.

Internet.org

Free BasicsFacebook Free BasicsFree Basics by Facebook
At a keynote presentation at the Mobile World Congress in Barcelona in February 2014, Facebook CEO Mark Zuckerberg said that Facebook's acquisition of WhatsApp was closely related to the Internet.org vision.
In the presentation, Zuckerberg says that Facebook's recent acquisition of mobile messaging app WhatsApp for $19 billion was closely related to the Internet.org vision.

BlackBerry

BlackBerry Internet ServiceBlackBerriesBlack Berry
Koum then hired a friend in Los Angeles, Chris Peiffer, to develop a BlackBerry version, which arrived two months later.
In 2018 it was reported that BlackBerry would be filing legal action against Facebook over perceived intellectual property infringements within both Facebook Messenger and WhatsApp as well as with Instagram.

Signal (software)

Signal
In September 2017, WhatsApp's co-founder Brian Acton left the company to start a nonprofit group, later revealed as the Signal Foundation, which now develops the WhatsApp competitor Signal. On November 18, 2014, Open Whisper Systems announced a partnership with WhatsApp to provide end-to-end encryption by incorporating the encryption protocol used in Signal into each WhatsApp client platform.
On February 21, 2018, Moxie Marlinspike and WhatsApp co-founder Brian Acton announced the formation of the Signal Foundation, a 501(c)(3) nonprofit organization whose mission is "to support, accelerate, and broaden Signal’s mission of making private communication accessible and ubiquitous."

Facebook

Facebook LiveFacebook.comFacebook, Inc.
On May 18, 2017, it was reported that the European Commission would fine Facebook €110 million for "misleading" it during the 2014 takeover of WhatsApp.
In February 2014, Facebook announced that it would be buying mobile messaging company WhatsApp for US$19 billion in cash and stock.

App Store (iOS)

App StoreiOS App StoreApple App Store
In January 2009, after purchasing an iPhone and realizing the potential of the app industry on the App Store, Koum and Acton began visiting Koum's friend Alex Fishman in West San Jose to discuss a new type of messaging app that would "[show] statuses next to individual names of the people".

NSO Group

The hack, allegedly developed by Israeli surveillance technology firm NSO Group, injected malware onto WhatsApp users’ phones via a remote-exploit bug in the app's Voice over IP calling functions.
In May 2019, messaging service WhatsApp alleged that a spyware injection exploit targeting its calling feature was developed by NSO.

Telegram (software)

TelegramTelegram MessengerGram (cryptocurrency)
Telegram claimed that it acquired 8 million new users; and Line, 2 million.
In February 2015, creators of the unofficial Whatsapp+ client released the Telegram Plus app, later renamed to Plus Messenger, after their original project got a cease-and-desist order from WhatsApp.

Sequoia Capital

SequoiaSequoia IndiaSequia Capital
In April 2011, Sequoia Capital invested about $8 million for more than 15% of the company, after months of negotiation with Sequoia partner Jim Goetz.
Sequoia Capital has invested in over 250 companies since 1972, including Apple, Google, Oracle, PayPal, Stripe, Bird, YouTube, Instagram, Yahoo! and WhatsApp.

Instant messaging

instant messengerIMinstant message
In the 2010s, more people started to use messaging apps like WhatsApp, WeChat, Facebook Messenger, Signal and Line rather than instant messaging like AIM.

Opus (audio format)

OpusOpus audio format.opus
WhatsApp's voice codec is Opus, which uses the modified discrete cosine transform (MDCT) and linear predictive coding (LPC) audio compression algorithms.
Opus is widely used as the voice-over-IP (VoIP) codec in applications such as WhatsApp and the PlayStation 4.

Over-the-top media services

over-the-topOTTover-the-top content
In April 2015, Forbes predicted that between 2012 and 2018, the telecommunications industry would lose $386 billion because of OTT services like WhatsApp and Skype.
An example is the Facebook-owned mobile application WhatsApp, that serves to replace text messaging on Internet connected smartphones.

Pidgin (software)

PidginGaimlibpurple
In 2014, an unofficial open source plug-in, whatsapp-purple, was released for Pidgin, implementing its XMPP and making it possible to use WhatsApp on PCs running Microsoft Windows and Linux.
Additional protocols, supported by third-party plugins, include Microsoft OCS/LCS (extended SIP/SIMPLE), Telegram, Facebook Messenger, QQ, Skype via skype4pidgin plugin, WhatsApp and the Xfire gaming network (requires the Gfire plugin).

Aeroméxico

AeromexicoAeronaves de MexicoAeronaves de México
WhatsApp also announced a forthcoming business platform to enable companies to provide customer service at scale, and airlines KLM and Aeroméxico announced their participation in the testing.
In September 2017 Aeromexico announced that it would be among the first companies worldwide to start services on WhatsApp's new Enterprise solution – the first time large companies would be able to provide customer service to users at scale.

Signal Messenger

Open Whisper SystemsSignal Messenger LLC
On November 18, 2014, Open Whisper Systems announced a partnership with WhatsApp to provide end-to-end encryption by incorporating the encryption protocol used in Signal into each WhatsApp client platform.
On November 18, 2014, Open Whisper Systems announced a partnership with WhatsApp to provide end-to-end encryption by incorporating the Signal Protocol into each WhatsApp client platform.

Signal Protocol

According to a white paper that was released along with the announcement, WhatsApp messages are encrypted with the Signal Protocol.
Several closed-source applications claim to have implemented the protocol, such as WhatsApp, which is said to encrypt the conversations of "more than a billion people worldwide".

Signal Foundation

In September 2017, WhatsApp's co-founder Brian Acton left the company to start a nonprofit group, later revealed as the Signal Foundation, which now develops the WhatsApp competitor Signal.
On February 21, 2018, Moxie Marlinspike and WhatsApp co-founder Brian Acton announced the formation of the Signal Foundation, a 501(c)(3) nonprofit organization.

Conversational commerce

In September 2017 WhatsApp announced the pilot of its new Enterprise solution, the first time large companies would be able to attend to large groups of customers in an approved WhatsApp solution, after WhatsApp banned earlier unofficial solutions.

XMPP

Extensible Messaging and Presence ProtocolJabberJabber/XMPP
In 2014, an unofficial open source plug-in, whatsapp-purple, was released for Pidgin, implementing its XMPP and making it possible to use WhatsApp on PCs running Microsoft Windows and Linux.
This includes WhatsApp, Google Talk and Facebook Chat (the deprecated Facebook messaging system).