Definition
Principal is the amount borrowed or the remaining loan balance owed to the lender.
If you are comparing mortgage options, treat principal as one piece of the total cost and risk picture, not a standalone detail.
Why It Matters
It matters because paying principal builds equity and reduces the balance that interest is charged on.
Simple Example
If a borrower takes a $320,000 mortgage, the original principal is $320,000.
How to Use This Term
When you see principal on a loan estimate, calculator result, or lender conversation, connect it to three practical questions: how it affects monthly payment, how it affects cash needed now, and how it affects flexibility later.