When you think of prenups, you might picture wealthy couples protecting millions, or even billions, of dollars, vacation homes, yachts and cherished family heirlooms. But you don't have to be a millionaire to benefit from a prenuptial agreement. Whether you're engaged or simply hope to get married someday, understanding how prenups work can help you make informed decisions before you ever walk down the aisle. Here's what you need to know about prenuptial agreements. Prenups What is a prenup?