Japan adopted Chinese characters (kanji) starting around the 5th century CE. Though Japan later developed its own phonetic scripts (hiragana, katakana), kanji remains essential for writing nouns, verb stems, and adjectives, vastly enriching vocabulary and enabling literary expression. Kanji literacy is a core part of Japanese education.
Buddhism arrived via Korea/China in the 6th century, transforming Japanese spirituality, art, architecture, and philosophy. Confucianism provided ethical and political frameworks—loyalty, filial piety, hierarchy—that shaped the samurai code, government bureaucracy, and family life for centuries.