Prefetch is a web performance optimization technique that involves loading specific resources or data in advance before they are needed. This is done to speed up future loading times, improving the user experience on a website. When a user visits a webpage, the browser can prefetch resources like images, CSS, or JavaScript files that are likely to be used in subsequent page visits. This anticipates future requests, reducing load times and enhancing the overall browsing experience. Prefetching is particularly useful in digital marketing for ensuring fast and smooth website interactions, which can positively impact engagement and conversions.