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<p>made when needed, ensuring each program has its own version when modifications occur. This technique is commonly applied to memory, files, and data structures.</p>

<p><big>In virtual memory management</big></p>
<p>Copy-on-write finds its main use in <a href="page.php?w=operating_system">operating system</a>s, sharing the <a href="page.php?w=physical_memory">physical memory</a> of computers running multiple <a href="page.php?w=Process_%28computing%29">processes</a>, in the implementation of the <a href="page.php?w=Fork_%28system_call%29">fork() system call</a>.</p><p>
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