A page replacement algorithm is a method used in operating systems to manage the use of memory when the physical memory (RAM) becomes full. Since processes typically require more memory than is available, the operating system must determine which pages (blocks of memory) to remove from memory when a new page needs to be loaded. The goal of these algorithms is to optimize memory usage and minimize the number of page faults, which occur when a program tries to access data that is not currently loaded into memory.
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