查询 (chá xún) means 'to query / look up' — it specifically refers to checking or retrieving information from a database, document, or system, not simply asking a person. It is more formal than 问 (wèn) and more systematic than 打听 (dǎ ting); it differs from 询问 (xún wèn 'to inquire'), which is about orally asking questions, and from 咨询 (zī xún 'to consult'), which seeks professional advice or guidance.