How much is $100 bond in dollar?

Excuse me, I'm a bit confused about the value of bonds. Could you clarify for me: When someone says they have a $100 bond, does that mean they actually possess the equivalent of $100 in cash? Or is there some sort of conversion rate or market value that needs to be taken into account? I'm specifically interested in understanding how much a $100 bond translates to in dollar terms. Is it simply $100, or could it be more or less depending on various factors? Thank you for your assistance in clarifying this matter.