Instant Messaging
WhatsApp is a free multiplatform instant messaging app that can be used on Android and iPhone smartphones or Windows and Mac PCs. WhatsApp lets its users stay in touch with others by making voice or video calls, sending text messages, and exchanging various media files, including audio, photos, and videos.
Telegram
Telegram is a cloud-based cross-platform messaging service used to message other Telegram users, make audio or video calls, create groups, share media files, and send stickers. Telegram prioritizes privacy and security, enhanced encryption, and speed.
Messenger
Messenger is a free messaging app that lets Facebook users connect with their Facebook friends by sending messages, conducting voice or video calls, as well as exchanging stickers, photos, and videos. Messenger now also powers conversations within Portal, Instagram, and Oculus VR.