1the masses
2the great bulk of the population
3popular (of music, science etc)
Examples
zhè这wèi位zhù míng著名de的dēng shān登山jiā家pī píng批评dà zhòng大众lǚ yóu旅游。
这位著名的登山家批评大众旅游。
This famous mountain climber is a critic of mass tourism.
我只是个大众脸。
I'm just another man.
夏威夷是一个大众化旅游圣地。
Hawaii is a popular tourist resort.