Interrupt Service Routine (ISR)

An Interrupt Service Routine (ISR) is a specialized function in a computer system that temporarily pauses the main program to quickly handle an urgent task or event, such as incoming data or a hardware signal. When an interrupt occurs, the system saves its current work, runs the ISR to address the issue, and then resumes normal operation. This process allows the computer to respond efficiently to important events without constantly checking for them, ensuring smooth and timely operation of embedded systems, computers, or devices.