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If CPU is referred to a page which is not loaded into Main Memory. Then it is known as page fault. Page fault occurs while searching for a page but not for a word. So, when CPU fetches page table and required page is missing, then OS takes charge and loads the required page from secondary memory to Main memory . The time taken for loading is known as Page Fault Service Time. After loading into main memory , fetching for a word takes negligible time compared to Page Fault Service time.