Updated: 10/11/2017 by Computer Hope

Short for Non-Maskable Interrupt, NMI is the highest-priority interrupt capable of interrupting all software and non-vital hardware devices. The NMI is not commonly used and usually only used to verify if a serious error has occurred or stop all operations because of a failure. For example, when you press Ctrl+Alt+Del when the computer freezes or stops responding a NMI is sent to the CPU.

Tip: Unlike an INTR or interrupt, the NMI cannot be interrupted by any other interrupt.

Hardware terms, Interrupt