DLL

DLL uses minimal resources as it can reduce the duplication of the code that is loaded on the disk memory. The DLL libraries usually have the file extension DLL, OCX (for libraries containing ActiveX controls), or DRV (for legacy system drivers). The DLL file formats are similar to the Windows EXE files – that is, Portable Executable (PE) for 32-bit and 64-bit Windows, and New Executable (NE) for 16-bit Windows. DLLs files also contain the combination of code, data, and resources.