QQ is a popular Chinese instant messaging and social media platform developed by Tencent. It allows users to chat via text, voice, and video, as well as share images, files, and status updates. QQ also offers features like online gaming, group discussions, and virtual avatars. It serves as an all-in-one digital space for social interaction, communication, and entertainment, primarily used in China but also available internationally. Essentially, QQ functions much like other messaging apps but with additional integrated services and a significant user base in China.