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WhatsApp Messenger, or simply WhatsApp, is an American freeware, cross-platform centralized messaging and voice-over-IP (VoIP) service owned by Facebook, Inc.[13] It allows users to send text messages and voice messages,[14] make voice and video calls, and share images, documents, user locations, and other content.[15][16] 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.[17] The service requires a cellular mobile telephone number to sign up.[18] 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.[19][20]