What is the purpose of a browser's cache?

The purpose of a browser's cache is to store temporary data for faster access. When you visit websites, your browser saves certain elements like images, scripts, and stylesheets in the cache. This way, when you revisit those sites, your browser can load them more quickly because it retrieves these elements from the cache rather than downloading them again from the web server. This process not only enhances the speed of web browsing but also reduces internet bandwidth usage, leading to a more efficient user experience.

The other options refer to different functions. For instance, securely saving user passwords is managed by the browser's password manager rather than the cache. Downloading files from the server is a normal part of browsing but is not the primary function of the cache. Displaying HTML structure relates to how a browser renders web pages but does not specifically pertain to the role of the cache. Thus, the correct answer highlights the cache's function of enhancing browsing speed through temporary data storage.