Federal National Mortgage Association is a government-sponsored enterprise chartered by Congress. The Company serves as a source of liquidity for purchases of homes and financing of multifamily rental housing, as well as for refinancing existing mortgages. It operates through two segments: Single-Family and Multifamily. Its Single-Family and Multifamily segments engage in business activities that provide liquidity to the mortgage market and manage the availability and affordability of housing in the United States. The Single-Family segment operates in the secondary mortgage market relating to loans secured by properties containing four or fewer residential dwelling units. The Multifamily segment operates in the secondary mortgage market relating primarily to loans secured by properties containing five or more residential units. The Company funds its business primarily through the issuance of short-term and long-term debt securities in the domestic and international capital markets.