The Visa Section at the U.S. Embassy in Kabul is currently closed to the public due to COVID-19. We are unable to provide immigrant and nonimmigrant visa services that require an in-person appearance or interview
You can find the latest information on COVID here: https://af.usembassy.gov/covid-19-information/
The Immigration Act of 1990 established the Diversity Visa (DV) program, where 55,000 immigrant visas would be available in an annual lottery, starting in fiscal year 1995. The lottery aims to diversify the immigrant population in the United States, by selecting applicants mostly from countries with low rates of immigration to the United States in the previous five years.
You can learn more about the Diversity visa Program on usvisas.state.gov.