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English word WhatsApp comes from English app, English what's up
app (English)
(computing, mobile phones) An application (program), especially a small one designed for a mobile device.. (informal) appetizer. (military) application (not a computer program). (sports) an appearance in a game (e.g., a player with 10 apps in a season played 10 times).
what's up (English)
WhatsApp (English)
An instant messaging service, used by around a billion people, founded in 2009 and acquired by Facebook in 2014.