A certificate of deposit (CD) is a type of time deposit that has a fixed maturity date. This means that the funds cannot be withdrawn until the maturity date has been reached. In exchange for this restriction, the financial institution typically offers a higher interest rate on the CD compared to a regular savings account. CDs are a popular investment option for those looking for a safe and stable way to earn interest on their funds. However, it is important to carefully consider the length of the maturity date, as withdrawing funds before the date can result in penalties.