They help conserve memory. If two or more applications use the same DLL, the DLL has its pages in RAM once and the pages are shared by all of the applications. The C/C++ run-time library is a perfect example. Many applications use this library. If all these applications link to the static library, the code for functions such as sprintf, strcpy, malloc, and so on exist in memory multiple times. However, if all these applications link to the DLL C/C++ run-time library, the code for these functions is in memory only once, which means that memory is used more efficiently.

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