Explain the lend-lease act

Allowed sales or loans of war materials to any country whose defense the president deems vital to the defense of the U. S

"Proposed in late 1940 and passed in March 1941, the Lend-Lease Act was the principal means for providing U. S. military aid to foreign nations during World War II. It authorized the president to transfer arms or any other defense materials for which Congress appropriated money to 'the government of any country whose defense the President deems vital to the defense of the United States.' By allowing the transfer of supplies without compensation to Britain, China, the Soviet Union and other countries, the act permitted the United States to support its war interests without being overextended in battle."