What is pagefile.sys used for in windows quizlet?

Pagefile.sys is a system file in Microsoft Windows operating systems that serves as virtual memory. It is used to store data that cannot be held in the system's physical RAM. When the system's memory usage exceeds the available physical RAM, the operating system moves the least-used pages of memory to the pagefile.sys, making room for more actively used memory in the physical RAM. The size of the pagefile.sys can be customized by the user or managed by the operating system. It is typically located in the root directory of the system drive and is set to be hidden by default.