What is the difference between unregistered trademarks, registered trademarks, and trademarks under application for registration in use?

Unregistered trademarks and registered trademarks are two forms of trademarks. Regardless of whether a trademark is used or not, as long as it complies with the provisions of the Trademark Law and is approved for registration by the trademark authority, the applicant obtains the exclusive right to the trademark and is protected by law. Others cannot use the trademark on the same or similar goods. Registered trademarks must be marked with the registration mark when in use. Before obtaining the trademark registration certificate, trademarks under application for registration are treated the same as unregistered trademarks in use and are not allowed to be marked with the registration mark, otherwise it is impersonating a registered trademark.