What exactly are Temporary Internet Files?
The Temporary Internet Files (or cache) folder contains Web page content that is stored on your hard disk for quick viewing. This cache permits Internet Explorer or MSN Explorer to download only the content that has changed since you last viewed a web page, instead of downloading all the content for a page every time it is displayed.
Despite all these positive things about Temporary Internet Files, they have one big drawback: they compromise your privacy. Everyone with access to your computer can look into your Temporary Internet Files folder and see the sites that you have visited in the past. You can manually delete the contents of Temporary Internet Files folder but this will not erase all traces of the pages because a special file called Index.dat is placed in this folder and it will still preserve the names and even the dates of your first visits to many pages.
For steps to delete these files, read more