A more thorough explanation:

The UNCITRAL Rules are a set of arbitration rules created by the United Nations Commission on International Trade Law. These rules apply to all international commercial arbitrations, unless they are prohibited by the local law where the arbitration takes place.

For example, if a company from the United States and a company from Japan have a dispute over a contract, they may choose to use the UNCITRAL Rules for their arbitration proceedings. However, if the arbitration is taking place in a country where the UNCITRAL Rules are not recognized or allowed, they would have to use a different set of rules.

The UNCITRAL Rules provide a framework for conducting arbitration proceedings, including rules for appointing arbitrators, conducting hearings, and issuing awards. They are designed to be flexible and adaptable to different types of disputes and legal systems.