Prefetch is a technique used in computing to improve performance by loading data or instructions into memory before they are actually needed. This anticipatory action helps reduce wait times, as the system can access the preloaded information more quickly when required. It is commonly used in web browsers, CPU architectures, and database systems. In web development, prefetching can enhance user experience by loading resources like images or scripts in advance, making pages load faster when users navigate. Similarly, in gaming, prefetching can help load game assets ahead of time, ensuring smoother gameplay and reducing lag during critical moments.