There are two types of family-based immigrant visas:
Immediate Relative – these visas are based on a close family relationship with a U.S. citizen, such as a spouse, child, or parent. The number of immigrants in these categories is not limited to each fiscal year.
Family Preference – these visas are for specific, more distant, family relationships with a U.S. citizen and some specified relationships with a Lawful Permanent Resident (LPR). The number of immigrants in these categories is limited each fiscal year.