answer question on swapping vs paging

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@@ -77,6 +77,17 @@ Your answer for each question should be about 150 words. (100 marks total)
 > numbers.
 
 1. Explain the distinction between a demand-paging system and a paging system with swapping. (8 marks)
+
+  Demand paging is a technique where a program is loaded from disk into memory on demand.
+  This technique loads pages of memory for a program only when it is needed rather than
+  loading the entire program into memory. Pages that are never used are never loaded into
+  memory. This technique saves on memory because it only loads what is needed.
+
+  When memory is paged to disk a pager will only load the pages from disk into memory that
+  are required for the current process execution. Typically a swapper would page the entire
+  program memory to and from disk. The swapper provides a savings by only loading the pages
+  of memory that are needed.
+
 1. How does the second-chance algorithm for page replacement differ from the FIFO page replacement algorithm? (8 marks)
 
 > The simplest page-replacement algorithm is a first-in, first-out (FIFO)