A browser cache is a storage location on your computer where your web browser keeps copies of web pages, images, and other content. When you visit a website, your browser saves some of its data in the cache to speed up future visits. This means that when you return to the same site, it can load faster because it doesn't have to download everything again. The cache helps reduce internet bandwidth usage and improves overall browsing speed. However, sometimes it can cause issues, like displaying outdated content. In such cases, clearing the cache can help refresh the stored data and ensure you see the latest version of a website.