Can you explain the concept of virtual memory and its role in resource management?

Virtual memory is a mechanism of the operating system that allows programs to use more memory than is physically available in the system by using disk space as an extension of RAM.

Main roles of virtual memory:

• Abstracting physical memory: each program works with its own address space, which increases security and process isolation.
• Resource management: the OS can load only the necessary data pages into RAM, while the rest are stored on disk, optimizing memory usage.
• Simplifying programming: developers do not worry about the physical location of data.

Example: if a program needs 4 GB of memory, but the system has only 2 GB of RAM, the OS will swap parts of data from the disk (swap), creating the illusion of a larger memory volume.

Thus, virtual memory helps efficiently manage resources and ensures the stability of application operation.