K Visa - Fiance Visa
K-1. Fiancés or fiancées of U.S. citizens coming to the U.S. for the purpose of getting married.
K-2. Minor, unmarried children of K-1 visa holders.
K-3. Spouses of U.S. citizen petitioners awaiting USCIS approval of their immigrant visa petition and the availability of an immigrant visa, who'd like to enter the U.S. and apply to adjust status, as a supposedly shorter way through the system. (This visa is almost never used, as it tends to actually save no time and cost more.)
K-4. Unmarried children of K-3 visa holders.
K-2. Minor, unmarried children of K-1 visa holders.
K-3. Spouses of U.S. citizen petitioners awaiting USCIS approval of their immigrant visa petition and the availability of an immigrant visa, who'd like to enter the U.S. and apply to adjust status, as a supposedly shorter way through the system. (This visa is almost never used, as it tends to actually save no time and cost more.)
K-4. Unmarried children of K-3 visa holders.