When the applications running on your computer need more RAM than the supported RAM capacity, the least used files from the RAM are automatically transferred to pagefile.sys on your hard disk. It is to be found on your hard drive (SSD or HDD). Pagefile.sys is a system file on your PC that works as a virtual memory in Windows 10. That does not mean you cannot remove it, but you should know what impact it may have on your system. sys extension might stop you from hitting the delete button and that is good because it is a system file that can be in active use by your computer. If you ever had storage space issue and went looking for large files to delete from your Windows PC, you might have come across pagefile.sys, which can be huge and easily grow up to several GBs in size.
