Virtual Memory in CPU (Computing Possessor Unit)
Virtual memory is a common component in most operating systems in desktop computers. The reason for this is due to the fact that they provide a large benefit to the user at a low and reasonable cost. Most computers today have something along the lines of 64 to 128 megabytes (mb) of RAM (Random Access Memory) available for use of the CPU (Central Possessing Unit). A lot of the time, that amount of RAM is insufficient to run all applications at once. For example, if you open a web browser, an email, Microsoft Word all at once into RAM, 64mb is not enough to run them, so if Virtual Memory did not exist, your computer would say, "Sorry, unable to load applications. Please close an application to open a new one". However with Virtual Memory, it can look for areas of RAM that have not recently been used and copy them onto the hard drive.This frees up space in RAM to load new applications.
This gives your computer the impression that it has unlimited amount of free space in RAM, even tho it only has 32mb installed. Also this effect gives you a nice economic benefit as hard disk is much cheaper then RAM chips.