Sister cities are cities in different countries that have a special connection with each other. Sister City International is an organization that helps cities all over the world build friendships and partnerships with other cities in different countries. The organization helps cities work together to share ideas, culture and experiences. They also help cities to find ways to help each other and to collaborate on solutions to global problems, like poverty and environmental issues. Sister City International has helped cities around the world to strengthen their bonds and create long-lasting relationships.