Garbage may refer to any of the following:
1. Information that has no significance and usually does not make sense. For example, garbage can be formed by pressing random keys on your keyboard. If you're opening a file and it appears to be garbage, like the example shown to the right, it's likely that the file is encrypted or formatted to be open in a specific program. For example, a .DOC file opened in Microsoft Word will look normal. However, if opened in a plain-text editor, like Notepad, it will appear as garbage.
3. Garbage is data that a software program stores in computer RAM (memory) that is no longer needed by that program. This garbage data is often removed through a process called garbage collection to free up memory space.