What happens when a bond becomes due everfi?

I believe the answer is: The issuer will pay you back, plus interest

The interest rate that given would be informed by the time an investor pursue the bond. This would create a mutually beneficial relationship between he issuer and the investor. The issuer obtain a financial boost for their operation while the investor obtain a profit.

By definition, a bond is a piece of the document as issued by the government or an institution that contains its promise in paying the borrowed money including the interest already of the buyer of this document. The interest piles up as bonds become overdue, therefore the money borrowed would be paid in a much higher value.