Trademark inquiry refers to the procedure that an applicant for trademark registration inquires about trademark registration in the trademark registration authority in person or by entrusting a trademark agent to find out whether the trademark he intends to apply for registration is the same as or similar to the trademark registered or being registered by others.

Trademark is a significant symbol of words, graphics, letters, numbers, three-dimensional signs, sounds, colors or the combination of the above elements used by commodity producers and operators in their production, manufacturing, processing, selection and distribution of commodities or services provided by service providers, and it is a product of modern economy. In the commercial field, trademarks, including words, graphics, letters, numbers, three-dimensional signs and color combinations, as well as the combination of the above elements, can be applied for registration as trademarks. A trademark approved for registration by the state is a "registered trademark" and is protected by law. Trademarks protect trademark registrants by ensuring that they have the exclusive right to mark goods or services or license others to use them for compensation.