I learned about the difference that appears between cultures. I'd like to show some examples to understand difference caused by social or cultural factors.
In the medieval European world, people were afraid of forest. There were many accidents in the    dark forest. In fact, robbers lived there. These fears to forest become visible in fairy tales like The sleeping beauty. How many people have fear to forest nowadays? It can be said that varied social factor causes this difference. In Greece, you must not have taxi stop like in Japan. Pointing the palm of hand toward a person means impoliteness.
Cultural difference causes some problems. Therefore, it is important to notify there are many difference between nations or cultures.