Difference Between DLL and EXE

DLL

• A Dll is a Dynamic Link Library can not run itself, used as a supportive file to other application.
• The Library Functions are Linked to the Application at Run Time (Dynamically) So the name is Dll. 
• A Dll does not contain an entry point (main function) so can not run individually.

EXE

• An Exe is executable file and is not a supportive file rather itself an application.
• An Exe will contain an entry point (main function) so runs individually.

SNO	DLL	EXE
1	Can not run Individually	Runs Individually
2	Used as supportive file for other Application	Itself an Application
3	Does not contain an entry point (no main function) so can not run individually	Contains an entry point (Main function) so can run individually
4	A Program /Application with out main creates a DLL after compilation.	A Program /Application With main creates an EXE after compilation.
5	OS does not create a separate process for any DLL rather DLL will run in the same process created for an EXE	OS Creates a separate process for each EXE it executes.

 
Note: Creating a process is an overhead to the operating system so DLL does not contain main function to reduce the burden on the OS.

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