Multi-processing is a computing technique that allows a system to run multiple processes simultaneously. This means that a computer can perform several tasks at the same time, improving efficiency and performance. Each process operates independently, sharing the system's resources like memory and CPU power. In a multi-processing environment, the operating system manages these processes, ensuring they do not interfere with each other. This is particularly useful in applications that require heavy computation, such as data analysis or video rendering, where dividing tasks can significantly reduce processing time and enhance overall productivity.