A culture is a specific group of people during a particular time — like the hippie culture of the 1960's. Culture can also imply exposure to the arts. Visit a museum if you are in need of a dose of culture.
A useful thing to remember about culture is that it is closely related to cultivate, whose root meaning is "to till the soil." Even in Latin, the source language, cultura was used metaphorically (Cicero said philosophy was cultura animi, the "cultivation of the soul"), and in English it moved from the agricultural sense to training, development of language and literature, mental development through education, and finally the ideas, customs, and intellectual and artistic conditions of a society or group.