Even so, not all countries are eligible for the visa lottery. No green cards are available to countries sending more than 50,000 immigrants to the U.S. in the past 5 years. To be eligible you must meet two requirements. First you must have a high school education or its equivalent. The main reason so many foreign nationals are excited about the green card lottery is that when someone wins, their spouse and all unmarried children under 21 years of age also receive visas.
Foreign nationals living in the U.S. can also enter.
With a Green Card you will be able to live and work permanently in the United States and enter and leave as you like. As a greencard holder you will be eligible to receive health and education benefits. You can also sponsor relatives to the United States. With a Green Card you have legal status. After you have been a permanent U.S. resident for 5 years you can apply for U.S. citizenship, or you can continue to live in the U.S. as a greencard holder.