A "Sister City" is a partnership between two cities from different countries that promotes cultural and commercial ties. This relationship often involves exchanges in areas such as education, tourism, and business, fostering mutual understanding and cooperation. Sister City programs aim to enhance friendship and collaboration between communities. These partnerships can also address global challenges, such as economic development and environmental sustainability. Many cities participate in these programs, creating a network of international relationships that benefit local residents. Notable examples include Paris and Rome, which have been sister cities since 1956, sharing cultural events and initiatives.