A mortgage is a loan used to buy a home. It's an agreement between you (the borrower) and a lender, like a bank or credit union, who gives you the money to purchase a property. In return, you promise to pay back the loan over a set period, typically 15 or 30 years.

The home itself serves as collateral for the loan. This means if you stop making payments, the lender has the right to take the property. It's a serious commitment, but it's also how most people are able to afford a home.

Each month, you'll make a payment to your lender. This payment isn't just one lump sum; it's made up of a few key parts. The two most important components are principal and interest.

Together, these two parts make up the core of your monthly mortgage payment. While the total amount you pay each month might stay the same, the portion that goes toward principal versus interest changes over time. This process is called amortization.

This structure is why you build equity (the portion of your home you own outright) slowly at first and much faster toward the end of your loan.

Lenders offer different types of interest rates, which directly impacts how your payments are calculated. The two most common types are fixed-rate and adjustable-rate mortgages.

With an ARM, your monthly payments can go up or down after the initial fixed period. This introduces more risk, but ARMs often start with a lower interest rate than fixed-rate mortgages, which can be appealing.

Choosing between them depends on your financial situation and tolerance for risk. A fixed-rate loan offers stability, while an ARM offers a potentially lower initial payment but less predictability in the long run.

Let's check your understanding of these core mortgage concepts.

Now that you have a handle on the fundamentals, you're better equipped to explore more complex topics, like deciding whether it makes sense to refinance.