WhatsApp is a cross-platform mobile messaging app which allows users to exchange messages without having to pay for SMS. The app is free to download and use, and is available on Android, iOS, BlackBerry, Windows Phone, and Nokia devices. WhatsApp was founded in 2009 by Jan Koum and Brian Acton. Koum had previously worked on the messaging platform Yahoo! Messenger, and Acton had been an early employee at Facebook. In January 2014, Facebook announced that it was purchasing WhatsApp for $19 billion. WhatsApp has over 1 billion active users worldwide, making it one of the most popular messaging apps in the world. The app is particularly popular in countries such as India, Brazil, and Mexico.

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