Which type of product commonly uses adjustable rate loans?

Adjustable rate loans are often associated with products that require longer-term financing and have an element of risk due to the fluctuating payments based on interest rate changes. Credit cards typically use variable interest rates that can adjust periodically based on certain benchmarks, which relates well to the concept of adjustable rate loans. This can lead to monthly payments that vary based on current market rates, making credit cards a fitting example of this type of financial product.

In contrast, personal loans and automobile loans usually feature fixed interest rates, providing borrowers with consistent monthly payments. Passbook loans generally operate on a more static interest rate model as well. Therefore, credit cards stand out as the product that commonly incorporates adjustable rates, aligning with the nature and dynamics of adjustable rate loans.