The MOVE Act requires Fannie Mae and Freddie Mac, the government-sponsored mortgage companies, to begin purchasing and securitizing a new type of mortgage product called portable mortgages within 180 days of the law's enactment. These portable mortgages would allow homeowners to transfer their current interest rate, loan terms, and remaining balance to a new property when they sell their home, provided they do so within 90 days of the sale. This program applies only to conventional mortgages that meet existing standards for purchase by these agencies. The legislation aims to make homeownership more viable by allowing borrowers to keep favorable mortgage terms if interest rates have risen since they originally obtained their loan, potentially reducing the financial burden of relocating to a new home.