What are the key differences between the hardware and software interrupts?

Software interrupts uses computer hardware resources to generate interrupts,

where as hardware interrupts uses BIOS $($basic input output system$)$ calls to

generate interrupts.

Hardware interrupts mechanism is very similar to the software interrupting

mechanism and the key objective achieved is to make sure system addresses

requests from internal or external peripherals or system calls.

Hardware interrupt is triggered by external hardware and is one of the ways to

communicate with the external peripherals, hardware.

Software interrupt is triggered by software $($processes$)$ and considered one of

the ways to communicate with kernel $($operating system$)$ or to trigger system

calls, especially during error or exception handling.

GPU's can only generate hardware interrupts, whereas software interrupts are

generated by MAC operating system only.