WhatsApp Messenger, or Direct WhatsApp, is a US freeware, cross-platform messaging and voiceover IP (VoIP) service owned by Facebook, Inc. [] 46] It allows users to send text messages and voice messages, make voice and video calls, and share photos, documents, user locations and other media. [48] []] The WhatsApp client application runs on mobile devices but is also accessible from desktop computers, as long as the user's mobile device stays connected to the Internet as long as they use the desktop app Do This service requires users to provide a standard cellular mobile number to register with the service. [511] In January 2018, WhatsApp launched a standalone business app targeting small business owners, called WhatsApp Business, to allow companies to interact with users who use the WhatsApp client. Do