Can you explain how data exchange occurs between RAM and disk when using swap memory?

Swap memory is an area on the disk used by the operating system as an extension of the RAM. When the RAM runs out of space, the OS moves inactive memory pages to the disk into swap, freeing RAM for active processes.

The swapping process works as follows:

• If the system lacks RAM, it selects memory pages that have not been used for a long time.
• These pages are written to a swap file or swap partition on the disk.
• Freed RAM is used for current tasks.
• When data from swap is needed again, it is loaded back into RAM, and other pages may be unloaded if necessary.

This process is called "swapping" and is managed by the OS kernel. It allows more applications to run than can physically fit in RAM, but access to swap is slower because the disk is significantly slower than RAM.