Virtual memory is used to:

Virtual memory plays a crucial role in modern computer systems by allowing them to extend the available memory beyond the physical limitations of the installed RAM. This is accomplished by using a portion of the hard drive or SSD as temporary storage, simulating additional random access memory (RAM).

When a computer runs out of physical RAM while managing applications and processes, it leverages virtual memory to swap portions of data between the RAM and the hard drive. This enables the system to operate as if it has more RAM than is physically present, allowing for more applications to run simultaneously or larger applications to function without crashing due to memory shortages.

The concept of virtual memory is essential for multitasking and enhances the overall efficiency of a computer by ensuring that it can manage memory usage dynamically based on current needs, without requiring the user to manually manage the load or upgrade the hardware.

In contrast, the other options do not accurately represent the function of virtual memory. Boosting graphics capabilities relates more to the graphics processing unit (GPU) rather than the memory management system. Reducing hard disk space is not a function of virtual memory; instead, it often requires more storage space to accommodate the virtual memory files. Increasing physical RAM involves hardware improvements rather than the use of virtual memory techniques.