When potential home buyers begin to research mortgages for buying a home, they are confronted with a lot of different and possibly confusing words or contract terms. One of those terms is the length of the mortgage. The length of the loan is an important decision to make. Although there are mortgages with a variety of term lengths, 15 and 30 years are the most common. Home buyers should understand the differences between these loans, how they can affect the monthly payment and the way the loan is paid off. This comparison will help buyers make a more informed decision about their mortgage options.