How does compound interest work and why is it so powerful?

Compound interest is like having money that grows on its own, and it gets even better over time.

Imagine you have a piggy bank where your money lives. Every year, your piggy bank gives you some extra coins, this is interest. Now, if you leave those extra coins in the piggy bank, next year, the interest will be calculated not just on the original amount of money you had, but also on the extra coins you got last year. That’s compound interest.

Let’s say you start with 10 cookies in your piggy bank. If the bank gives you 2 extra cookies every year (that's 20% interest), after one year, you’ll have 12 cookies. The next year, it will give you 20% of 12 cookies, that’s 2.4 cookies! Now you have 14.4 cookies. Each year, your piggy bank gives you more and more cookies because the interest is growing on top of what you already have.

If you keep this going for many years, the number of cookies will grow faster and faster, just like how a small seed can turn into a big tree. That’s why compound interest is so powerful: it makes your money work harder over time.