The difference between static and dynamic link library link library

This article put it very well: https://www.cnblogs.com/tracylee/archive/2012/10/15/2723816.html

This is a summary of what,

1. Static link library directly included in the resulting executable files, dynamic link library (DLL) file in a separate folder with the executable, executable files and can be used dynamically unload DLL
2. Use DLL can save memory, and because the DLL and EXE independent, single DLL file can maintain and improve the program's sustainability and scalability.