The article "10. Foreign Policy" explores different ways to understand how countries interact with each other. It looks at theories and methods used to analyze foreign policy, which is how nations handle their relationships with other countries. The article discusses various ways to study foreign policy, such as looking at the international system, individual leaders, and the country as a whole. It also uses the Gulf War as an example to show how these different approaches can be combined. The article mentions that there are experts and organizations called 'think tanks' that research foreign policy extensively, not just in universities.