It is rare for Korea to use Chinese characters in formal occasions, but it is still used in some aspects. For example, the official documents and certificates of the People's Republic of Korea often use Chinese characters as writing aids. In addition, some of Korea's traditional culture and cultural heritage also often use Chinese characters. For example, the Korean Chinese character book, Hangul Zhengzi, recorded more than 3,000 Chinese characters. Although there are not many opportunities to use Chinese characters in formal occasions in Korea, Koreans still use Chinese characters in their daily lives. Some Koreans believe that Chinese characters are an important part of Chinese culture and hope to inherit and carry forward this cultural heritage.