National federations play essential roles in international competitions by overseeing governance, athlete representation, and compliance with international standards. These federations ensure that national teams adhere to the rules set by governing bodies such as the International Olympic Committee (IOC) or international sports federations. They are responsible for selecting athletes for competition, providing training resources, and promoting the sport within their countries. Additionally, federations facilitate funding and sponsorships, which help enhance athletes' preparedness for global events, ensuring success and fair representation on the international stage.