Chinese writing has origins dating back to the Shang dynasty (1500-950 BC) with characters evolving from oracle bones into today's simplified and traditional forms. Simplified characters became official in the People's Republic of China in 1949, while traditional characters remain in use in Taiwan, Hong Kong, Macau, and Malaysia. The structure of Chinese characters includes categories such as pictographs, ideographs, and semantic-phonetic compounds, and the language is tonal, requiring attention to pitch and stroke order in writing.