Okay, I did a quick search around about this and I did not see much that was helpful or pertinent to my question. My question is when I am in the Apps Management section of the Settings and there is the list of apps and services installed on my HTC Hero and I sort them by the size, what is the exact difference between "data" and "cache" in each of the apps installed? The apps using up the most space seem to have large caches of things, like the Mail and Internet app for example. I assume that the cache is the email and web pages, respectively, stored in my handset's internal memory. Is the data storing the settings for each of the apps? I suppose ultimately what I am getting at here is if I want to free up space in my handset's internal memory, which of these should I delete and what effect would it have on the apps that are associated with the deleted cache and/or data? I do not want to delete settings for apps if that is what data contains. Additionally, I am worried if I delete the cache for the Mail app, it would delete all the email stored on my handset at the moment. How do you all manage cache and data and your handset's internal memory? I am not running out of internal space at the moment, but I am just curious about this for future reference.