A file that Windows uses to temporarily store data. It is used to supplement the computer's physical memory. The hard drive space that Windows allots for the swap file is know as virtual memory.
A section of the hard drive that is reserved to temporarily store parts of running programs or information that is swapped out of memory to make room for other running programs. A Swap File is sometimes called Virtual Memory.
An area of your hard drive that the computer uses for RAM. Although slower, it is usually much more abundant.