Compound interest is one of those concepts that sounds simple but has a profound effect over time. Let me break it down into layers.

The core idea: with simple interest, you earn interest only on your principal. With compound interest, you earn interest on your principal and on the interest you've already earned. The interest compounds on itself.

A concrete example: ₹10,000 at 8% simple interest for 10 years = ₹18,000. The same at 8% compounded annually = ₹21,589. The difference grows dramatically over longer time horizons — at 30 years, it's ₹100,627 vs ₹34,000.

What would you like to explore next — the formula, compounding frequency, or how it applies to things like EMIs and SIPs?