红色 + (的) + Noun
The noun 红色 (hóngsè) means "red color" or simply "red." It can be used as a modifier before a noun to describe something that is red, as in 红色帽子 (red hat).
她最喜欢红色的花。
Tā zuì xǐhuan hóngsè de huā.
Her favorite flowers are red ones.
那辆红色的车是谁的?
Nà liàng hóngsè de chē shì shéi de?
Whose red car is that?
过年的时候到处都是红色的灯笼。
Guònián de shíhou dàochù dōu shì hóngsè de dēnglóng.
During Chinese New Year, there are red lanterns everywhere.