This is the 160th most frequent Chinese word.
日本
Japan.
日本 refers to the country Japan in the context of travel destination.
我计划明年去日本旅行。
I plan to travel to Japan next year.
日本 indicates the origin or attribute of the cherry blossoms, associating them with Japan.
日本的樱花在春天特别美丽。
Japan's cherry blossoms are especially beautiful in the spring.
日本 is used adjectivally here to specify that the culture and history being studied pertain to Japan.