Viber is a messaging service app.  It allows users to talk, send videos, and message long-distance for free, along with a variety of low-cost communication services.
It was originally developed in 2010 by Viber Media.  In 2014, the Japanese e-commerce company Rakuten acquired the app.  After Rakuten acquired Viber, it began expanding its services to include brand stickers, emoji, and games.
Its current free services include videos, texts, photos, doodles, Push-to-Talk services, HD-quality calling, and more. There is a low-cost service known as Viber Out that allows calling to any number anywhere in the world.
Its service Public Chats was released in 2014. This service allows users to read real conversations from their favorite media outlets, celebrities, brands, publishers, and the like.
Viber also launched its own game platform known as Viber Games in 2015. There are several free games to play that only require logging in with your Viber ID. For its games, Viber also acquired Nextpeer that allows gamers to connect and communicate with each other all over the world. Currently, these games are only monetized through in-game purchases of avatars and stickers, but the company plans to expand game profits with more international communication through the games instead of in-game advertisements.
This app currently has over 570 million users that span over 190 countries. It has plans to expand its services to become a robust app for global communication and entertainment.
Viber is currently available to anyone that has a 3G/4G or Wi-Fi connection on the following: Android devices, BlackBerry and Blackberry 10, Mac, Linux, Windows, Windows 10, and Windows Phone, iPhone, and iPad.