“What is the meaning of ISR?”

"An Interrupt Service Routine (ISR) is a software function in computer systems that handles interrupts which are signals requesting immediate attention from the CPU. ISRs manage tasks like hardware events or system errors ensuring smooth operation by temporarily halting normal processes to address the interrupt. Critical in operating systems and embedded systems ISRs enhance efficiency in real-time computing. Their role in system responsiveness underscores their importance in computer architecture particularly in applications requiring precise timing and resource management."