When an operating system receives interrupt from the printer and pauses CPU it is performing what?

When an operating system receives an interrupt from the printer and pauses the CPU, it is performing a context switch. A context switch is the process of saving the state of the currently running process (including the contents of its registers and the current program counter) and loading the state of the process that is to be run next. This allows the operating system to switch between different processes and give them each a chance to run.

In the case of a printer interrupt, the operating system will pause the CPU and save the state of the currently running process so that it can later be resumed. It will then load the state of the printer driver process and allow it to run. The printer driver process will then handle the interrupt from the printer and send the data to be printed. Once the printing is complete, the operating system will switch back to the previously running process and resume its execution.