What is Difference between DLL and EXE

dll	exe
Dll is the Inprocess component.	Exe is the out of process component.
Dll take the client memory space to run the component.	Exe uses its own memory(not application memory) to run the component.
In dll the communication between the application and component(dll) is very fast.	In exe the communication between the application and component(dll) is very slow.
Dll is loaded only once in memory when application starts.	Exe need to be loaded again and again.
Dll is run from an exe or another dll.	An exe has an entry point and can be run independently.