Highlighting an icon and then choosing File→Make Alias (or pressing ⌘-L) generates an alias, a specially branded duplicate of the original icon (Figure 3-7). It’s not a duplicate of the file—just of the icon; therefore it requires negligible storage space. When you double-click the alias, the original file opens. (A Macintosh alias is essentially the same as a Windows shortcut.)
You can create as many aliases as you want of a single file; therefore, in effect, aliases let you stash that file in many different folder locations simultaneously. Double-click any one of them, and you open the original file, wherever it may be on your system.