Kanji

}} are the logographic Chinese characters adapted from the Chinese script used in the writing of Japanese. They were made a major part of the Japanese writing system during the time of Old Japanese and are still used, along with the subsequently-derived syllabic scripts of and . The characters have Japanese pronunciations; most have two, with one based on the Chinese sound. A few characters were invented in Japan by constructing character components derived from other Chinese characters. After the Meiji Restoration, Japan made its own efforts to simplify the characters, now known as , by a process similar to China's simplification efforts, with the intention to increase literacy among the general public. Since the 1920s, the Japanese government has published character lists periodically to help direct the education of its citizenry through the myriad Chinese characters that exist. There are nearly 3,000 kanji used in Japanese names and in common communication.

The term in Japanese literally means "Han characters". It is written in Japanese by using the same characters as in traditional Chinese, and both refer to the character writing system known in Chinese as (). The significant use of Chinese characters in Japan first began to take hold around the 5th century AD and has since had a profound influence in shaping Japanese culture, language, literature, history, and records. Inkstone artifacts at archaeological sites dating back to the earlier Yayoi period were also found to contain Chinese characters.

Although some characters, as used in Japanese and Chinese, have similar meanings and pronunciations, others have meanings or pronunciations that are unique to one language or the other. For example, means 'honest' in both languages but is pronounced or in Japanese, and in Standard Mandarin Chinese. Individual kanji characters and multi-kanji words invented in Japan from Chinese morphemes have been borrowed into Chinese, Korean, and Vietnamese in recent times. These are known as Wasei-kango, or Japanese-made Chinese words. For example, the word for telephone, in Japanese, was derived from the Chinese words for "electric" and "conversation." It was then calqued as in Mandarin Chinese, in Vietnamese and in Korean.

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