A 2-1 buydown is a temporary buydown structure in which the payment or rate is reduced more in the first year and less in the second year before returning to the standard level.
A buydown is a pricing arrangement that lowers the borrower's mortgage rate or payment, either temporarily or for the full term, by using upfront money.
Lender credits are pricing concessions from the lender that reduce upfront closing costs, usually in exchange for a higher rate or different pricing structure.