An advisory opinion is a legal document issued by an expert or a group of experts that provides guidance and recommendations on a specific issue. It is not binding, which means it does not have to be followed, but it can provide valuable insight and help people make informed decisions. Advisory opinions are commonly sought in the field of law, where they may be requested by individuals or organizations seeking clarification on legal matters. In addition, advisory opinions may also be issued by regulatory bodies, such as government agencies, to provide guidance on compliance with certain rules and regulations.