Explain What Compound Interest Actually Does to a Savings Account Over Time

You have been told that compound interest is the eighth wonder of the world and that you should start saving now. This explains why, with actual numbers rather than graphs: what compounding means in practice, how often it compounds and why that matters, and one concrete implication for whether to start now or wait until you have more to put in.

Explain how compound interest works on a savings account, using a concrete numerical example. Cover: what compounding means and how it differs from simple interest; how frequency of compounding (monthly versus annual) affects the outcome; what the Rule of 72 is and how to use it as a rough calculator; and why starting earlier matters more than the interest rate for long-term growth. Use numbers rather than percentages alone where possible, and avoid financial jargon. End with one practical implication for someone deciding whether to open a savings account now or wait until they have a larger lump sum.