What is the difference between a K-1 visa and a fiancé visa?

There is no difference between a K-1 visa and a fiancé visa – they are both the same. Upon entry to the US under the K-1 visa, the fiancé and US citizen must marry within 90 days. Then the fiancé can apply for adjustment of status to permanent residence with U.S.C.I.S. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.