Index: The published index of interest rates on a publicly traded debt security used to calculate the interest rate for an ARM. The index is usually an average of the interest rates on a particular type of security such as the LIBOR.

Individual Retirement Account (IRA): A tax-deferred plan that can help build a retirement nest egg.

Inflation: An increase in the general level of prices.

Inquiry: A request for a copy of your credit report. An inquiry occurs every time you fill out a credit application and/or request more credit. Too many inquiries on a credit report can lower your credit score.

Interest: The cost you pay to borrow money. It is the payment you make to a lender for the money it has lent to you. Interest is usually expressed as a percentage of the amount borrowed.