Baidu

Baidu is the most-used Chinese-language search engine and the default entry point to the web for a large share of users in mainland China.

Its index leans heavily toward Chinese-language content and its own properties — Baidu Baike, Zhidao, Tieba and hosted pages often rank prominently, which means results skew toward the platform's own ecosystem more than a Western engine would.

For anyone targeting the Chinese market, Baidu SEO is a separate discipline from Google SEO: site speed from inside China, ICP filing status and simplified-Chinese content all affect visibility in ways that have no Western equivalent.