You can copy a file either in the same directory or a different directory. If the copy is in the same directory, the new file must have a different name than the original. If it's in a different directory, it can have the same name, though that's not a good idea because it can lead to confusion. When you move a file, you are removing it from the directory (or disk) where it was and moving it to a different one.
There are two basic ways to copy or move files in the My Computer area, as well as an optional (and I think easier) way using Windows Explorer, which I'll discuss later in this chapter.