According to the Department of State there are three types of visas for immigrants who want to live permanently in the United States. In other words, either you must have a family member or an employer petition for a visa for you with the Department of Homeland Security. Or, for the lucky few, you can obtain a petition by registering for the visa lottery. The three types of visas are:
1) Family-based immigrant visas
2) employment-based immigrant visas
3) diversity program immigrant visas