QQ is a communication application developed by Tencent. This application lets Chinese users chat with friends over text and video.
Known as one of the most popular instant messaging applications in China, QQ has been popular for being able to connect easily with a userbase of a billion users. Users who might not be the best at Chinese can use the built-in translate feature which allows you to translate over 50 different languages instantly.
Overall, QQ is a great instant messaging application if you are looking to communicate with friends and family living in China. You will feel limited though if you are looking to talk to people who know English though.