A fixed-rate mortgage carries the same interest rate for the full term of the loan, meaning the principal and interest portion of the monthly payment never changes. The most common terms are 30 years and 15 years.
The main advantage is predictability. Borrowers know exactly what their principal and interest payment will be for the life of the loan, which makes budgeting easier and protects them from rising interest rates. A shorter term like 15 years usually has a lower rate but higher monthly payments.
While the principal and interest stay fixed, the total payment can still change if property taxes or insurance costs rise, since those are often part of the escrowed payment. Fixed-rate loans contrast with adjustable-rate mortgages, whose rates can move over time.