What is the meaning of Adjustable Rate Mortgages?

Adjustable Rate Mortgages is a loan which has a coupon or interest rate that is subject to change on predetermined reset dates. These loans use interest rate indices as the benchmark rate. Adjustable Rate Mortgages come in many variations. Typically, the reset dates recur every 1, 3, or 5 years; but there are other periods used as well. These loans may have cap and floor features which constrain each reset change in interest rates. There may also be lifetime cap and floor features. Adjustable Rate Mortgages may be strictly amortizing though some have negative amortization features.