The .cache file extension is used to store cache information for a variety of different Internet browsers. In some instances a CACHE file can be used to pull up an image of a cached website when the user's computer is not connected to the Internet. For example, when a user chooses to save a website using his or her Internet browser, the website page will then be cached to the user's computer and the user will not have to access the Internet to access the information on that web page.
There are other applications, such as image editing programs, that also use the .cache file extension in order to speed up the loading times of recently-viewed application files.
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If you have additional information about the CACHE file format or software that uses files with the CACHE suffix, please do get in touch - we would love hearing from you.