Cached data is temporary data stored by a device, app, or browser to quickly access frequently used content. It reduces load times by saving files like images, scripts, or website elements locally. Caching is the broader process that enables this.
A file with the CACHE file extension contains temporary information that a program sets aside because it assumes you'll want to use it again soon. Doing this allows the software to load the information faster than it would take to find the original data.