Interrupts in operating systems are signals generated by hardware, such as drivers, that temporarily halt the currently executing thread, allowing the system to respond to events. This process involves saving the program state to an interrupt stack and invoking an interrupt handler, which is a routine designed to manage these signals. There are two primary methods for handling input in microprocessors: interrupt-driven input and polling. Interrupt-driven input allows hardware signals to trigger the operating system to execute an interrupt subroutine, which typically handles tasks like buffering input. In contrast, polling involves the operating system continuously checking the state of input pins, which can ensure that all inputs are treated with equal priority but is less efficient and rarely used. The discussion highlights the trade-offs between these methods, noting that while interrupts can lead to prioritization issues, polling can provide a more uniform handling of inputs, akin to a round-robin discussion format in a classroom setting.