Dual containment is a policy that makes sure two different countries don't get too powerful and cause problems for other countries. It involves providing support and help to two different sides in an area so that neither one gets too powerful. For example, if two countries close to each other, like Iraq and Iran, have been fighting, the United States might provide both sides with weapons and money so that they can remain at a balance. This way neither country will become too strong and they will not be able to act aggressively against other countries.