相关 (xiāng guān) is an adjective meaning 'related' or 'relevant' — describing a meaningful connection between two or more things. The first character 相 (xiāng) implies mutual or reciprocal relationship, while 关 (guān) means 'to concern', 'to involve', or 'to be linked'. Together, they form a compound that emphasizes a substantive, often logical or functional, connection — not just coincidence. It’s commonly used in formal, academic, professional, and technical contexts (e.g., health reports, policy documents, research papers) to indicate association, dependency, or significance.

This word rarely stands alone as a predicate without modification; it usually appears after a noun (e.g., 相关问题, related issues) or with structural particles like 的 (e.g., 相关的信息, relevant information). It can also function attributively before nouns or predicatively with 是 (e.g., 这与健康密切相关, This is closely related to health). While neutral in tone, it conveys precision and objectivity — making it less common in casual speech than simpler alternatives like 有关.