Question

Compare between maskable and non maskable interrupts.

Answer 1

A maskable interrupt is one that you can ignore by setting (or clearing) a bit in an interrupt control register. Typically your processor might allow multiple interrupt sources, but your design only requires some of them. You would mask off the unused interrupts so that noise on those lines doesn't cause problems. You might also want to mask off interrupt sources that are real, but of lower priority at particular points of your process.