In compound interest calculations, the principal is the initial sum of money invested or borrowed, prior to the addition of any interest.
This is the foundational sum upon which interest is computed at regular intervals. As time progresses, the accrued interest is added to the principal, forming a new base for subsequent interest calculations, which is the essence of compounding.
For instance, if ₹10,000 is invested at a specific compound interest rate, the principal is ₹10,000.