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Definition: Google Duo


A video calling app from Google for Android and iOS mobile devices. Introduced in 2016 to compete with FaceTime and WhatsApp, Google Duo was quickly downloaded by millions of users. Noted for its simplicity and automatically switching between cellular and Wi-Fi, Duo was designed to provide good visual quality over slow networks. It also supports end-to-end encryption. Duo's "Knock Knock" feature displays the caller before the recipient answers. See videoconferencing, Google Messages and Google Hangouts.