Web caching is a technique used to store copies of frequently accessed web content, such as images, videos, and web pages, on a temporary storage system. This helps reduce the time it takes to load a website, as the content can be retrieved quickly from the cache instead of fetching it from the original server every time. When a user visits a website, their browser or a nearby server may save a cached version of the content. This means that if the same user or others visit the site again, the cached content can be delivered faster, improving overall internet performance and reducing bandwidth usage.