What is the difference between Rnav and Rnp in navigation?

RNAV (Area Navigation) allows aircraft to fly on any desired flight path within the coverage of ground or satellite-based navigation aids, enhancing route flexibility and efficiency. RNP (Required Navigation Performance) is a specific type of RNAV that includes performance requirements for the navigation system, ensuring that an aircraft can maintain a certain level of accuracy and reliability during its flight. While both systems improve navigation, RNP has more stringent criteria and is often associated with advanced procedures like precision approaches.