Cha Ci Ku is a free online Chinese dictionary and language-reference website designed to help users look up words and characters. Its collection includes more than 400,000 entries, with information intended to support understanding, pronunciation, and practical use. Depending on the entry, visitors can find definitions, pinyin, synonyms, antonyms, example sentences, and sample usage.

The site also provides explanations of how characters are composed and interpreted, helping users explore the parts and meanings of Chinese words. Alongside its main Chinese dictionary, Cha Ci Ku offers online character lookup, stroke-order searches, and tools for finding words formed with particular characters. These services bring several common Chinese-language reference needs together in one accessible online resource.

The website presents itself as a free query service for readers seeking word meanings and related linguistic details. Its straightforward focus on searchable vocabulary and supporting information makes it a practical reference for people studying, reading, or checking Chinese words and characters