DOS interrupts

DOS interrupts are a way for software to communicate with the computer's hardware or operating system routines by sending predefined signals called "interrupts." Think of them as standardized messages that tell the computer to perform specific tasks, such as reading a keyboard input, displaying a message on the screen, or accessing files. These interrupts help programs work efficiently without needing to handle every hardware detail directly. In DOS, the most common interrupt is INT 21h, which provides a wide range of system services through these standardized signals.