When combined, 主流 (zhǔliú) means “mainstream” or “main current.” 媒体 (méitǐ) means “media” (literally “medium body/system”). Together, 主流媒体 (zhǔliú méitǐ) literally translates to “mainstream media,” but carries the strong implication of being the official, state-sanctioned current of information.
The concept of 主流媒体 (zhǔliú méitǐ) is central to understanding information flow in China. It's a powerful tool for governance and social management.
The term is used widely in both formal and informal settings.