Green card defined:

A "green card" gives you official immigration status (Lawful Permanent Residency) in the United states.

Green card lottery:

The US Green Card Lottery Program, known as DV (Diversity Visa) Lottery program, is a good opportunity for potential immigrants to obtain the status as a permanent legal resident of the USA. This program runs each year and provides 50,000 "Green Cards" to applicants randomly selected in a lottery process.
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