It became the world's most popular messaging application by 2015, and has over 2 billion users worldwide as of February 2020. of Mountain View, California, which was acquired by Facebook in February 2014 for approximately US$19.3 billion. The client application was created by WhatsApp Inc. In January 2018, WhatsApp released a standalone business app targeted at small business owners, called WhatsApp Business, to allow companies to communicate with customers who use the standard WhatsApp client. The service requires users to provide a standard cellular mobile number for registering with the service. WhatsApp's client application runs on mobile devices but is also accessible from desktop computers, as long as the user's mobile device remains connected to the Internet while they use the desktop app.

It allows users to send text messages and voice messages, make voice and video calls, and share images, documents, user locations, and other media. WhatsApp Messenger, or simply WhatsApp, is an American freeware, cross-platform messaging and Voice over IP (VoIP) service owned by Facebook, Inc.

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