Firstly: there is the employment-based immigrant visa, which is issued to individuals who have been offered employment by a US-based employer. This type of visa is divided into five categories and is dependent on the skills and qualifications of the individual.
The second: type of immigrant visa is designed for individuals who have a relative who is either a legal permanent resident or a citizen of the United States. There are four different subcategories for this visa that are based on the connection between the petitioner and the beneficiary.
Thirdly: there is the diversity immigrant visa, also known as the green card lottery. This visa is available to individuals from countries with historically low immigration rates to the United States.
Fourthly: there is the special immigrant visa, which is granted to individuals who have unique circumstances or are in a specific category, such as religious workers or International Organization employees.
Lastly: there is the refugee and asylum immigrant visa, which is designated for individuals who are fleeing persecution, war, or violence in their home country.
It is important to note that the application process and requirements for each visa type vary and may require the assistance of a legal professional. Individuals should thoroughly research and understand the eligibility criteria before applying for any immigrant visa to the United States.