Fannie and Freddie sounds like a brand of chocolates from the 1920s, or perhaps the names of your elderly grandparents you visit twice a year in upstate New York. Alas, neither is the case. So I bet you're wondering- "Who are Fannie and Freddie and why are they in my mortgage?"
Fannie Mae and Freddie Mac were actually created by Congress with the goal in mind of becoming an affordable and reliable source of mortgage funding for all Americans. The organizations provide funds to the financial institutions that shell out the cash you need to buy the home you want to buy- when you want to buy it.