The Cold War was a conflict between the Soviet Union and the United States. In this conflict, the two sides were trying to get more power and prestige in the world. The Soviets were communists while the US and its allies believed in democracy and capitalism. Each side wanted its ideology to take over the world. This conflict lasted from the end of World War II until 1991. Therefore, just about anything that happened in foreign relations during this time could be seen as an example of the Cold War. The Vietnam War was an example of the Cold War. So was the Soviet invasion of Afghanistan. There are many others.
There are also many implications of the Cold War. One implication is that the US became the leader of the “free world.” The US was seen as the major country that was trying to keep communism contained. Another implication is that the US was willing to do anything to keep communism contained. The US was even willing to support dictatorships as long as they were not communist. A final implication is that many people were worried that the Cold War would lead to an actual war between the US and the USSR that would be fought with nuclear weapons and would destroy the world.