.exe file is executable file which is based on abstraction(oops).We can just get the output display of the project. .dll file are used as reference in a project.so that all the public class and methods can be used in the project which uses the .dll file.

When any source file has main method then it executes & provides exe file Otherwise dll

EXE It is an executable file, which can be run independently. EXE is an out-process component, which means that it runs in a separate process. It cannot be reused in an application. It has a main function.DLL It is Dynamic Link Library that is used as a part of EXE or other DLLs. It cannot be run independently. It runs in the application process memory, so it is called as in-process component. It can be reused in an application. It does not have a main function.