From time to time people decide that they no longer need to keep a piece of information. For example, your backup copies of a particular file are sufficient, and you want to delete the master, what is the best way to do so? When you delete a file, even after you empty the Recycle bin, the contents of that file remain on your hard drive and can be recovered by anyone who has the right tools and a little luck. From a purely technical perspective, there is no such thing as a delete function on your computer. Of course, you can drag a file to the Recycle Bin and empty the bin, but all this really does is clear the icon, remove the file's name from on your computer, and tell Windows that it can use the space for something else. Until it actually does use that space, the space will be occupied by the contents of the deleted information, much like drawers of files with labels on each drawer, what happens is removing the label but the drawer still contain the files. This is why, i...