Galactic civilizations refer to advanced societies that exist across different planets and star systems within a galaxy. These civilizations can vary in technology, culture, and governance, often engaging in trade, diplomacy, or conflict with one another. The concept is popular in science fiction, where authors explore the possibilities of life beyond Earth and the interactions between various alien species. In many narratives, galactic civilizations are depicted as having vast empires, advanced technologies, and complex social structures. They may utilize spacecraft for exploration and colonization, and often face challenges such as resource management, interstellar warfare, and the ethical implications of their actions. Examples include the Star Wars universe and the Star Trek franchise.