What is “Containment” (as discussed in this class)?

What is “Containment” (as discussed in this class)? Briefly describe impacts it had on world regional geography.   containment, strategic foreign policy pursued by the United States beginning in the late 1940s in order to check the expansionist policy of the Soviet Union https://www.studyhelpus.com/Questions & Answers/what-is-containment-as-discussed-in-this-class/