Out-Of-Order Execution is a technique used in modern computer processors to improve performance. Instead of executing instructions in the order they appear, the processor can rearrange them based on the availability of data and resources. This allows it to make better use of its time and complete tasks more quickly. By executing instructions as soon as their required data is ready, Out-Of-Order Execution helps reduce delays caused by waiting for previous instructions to finish. This method enhances overall efficiency and speed, making it a key feature in many high-performance processors used in computers and servers today.