Compound interest is often called interest interest interest. They have a major impact on money growth over time. When you invest and incomes are reinvested, the total value grows rapidly. The longer money is invested, the greater the effect of compound interest. For example, a person who begins to invest early can accumulate a much larger equity than someone who begins later, even by investing smaller amounts. On the other hand, compound interest can also work against those who are in debt. Debts with high interest rates can grow rapidly if they are not controlled. Therefore, understanding this concept is fundamental to making smarter financial decisions.