A guarantor is someone who promises to pay someone else's debt or fulfill their obligation if that person can't or won't do it themselves. Think of it as being a safety net: if your friend borrows something and can't return it, the guarantor steps in to make things right.

Parents often serve as guarantors when teenagers get their first credit cards or when young adults rent their first apartments. The landlord or bank wants reassurance that if the rent goes unpaid or the credit card bill doesn't get paid, someone responsible will cover it. The guarantor is saying, “I trust this person, and if something goes wrong, I'll take care of it.”

Being a guarantor is a serious commitment. You're putting your own money and reputation on the line for someone else. If your cousin needs a guarantor to get a loan for college and can't make the payments, you become responsible for paying back that entire loan. That's why people usually only become guarantors for family members or very close friends they truly trust.