WHAT ARE DLL Files ?

WHAT ARE DLL Files ?

Short for Dynamic Link Library, Windows DLL files are the library of executable 
functions or data that can be used by a Windows application. A DLL provides one or 
more particular functions and a program accesses the functions by creating either a 
static or dynamic link to the DLL. A static link remains constant during program execution while a dynamic link is created by the program as needed. DLLs can also contain just data. DLL files usually end with the extension .dll, .exe, .drv, or .fon. DLL files are an essential component of applications and programs, without which those applications and programs cannot run properly.
      A DLL file can be used by several applications at the same time. Some DLLs 
files are provided with the Windows operating system and available for any Windows application. Other DLL files are written for a particular application and are loaded with the application.


WHAT IS WINDOWS.dll ?

Whitout Dynamic link libraies, or .dll files. A computer would be able to achieve a very small percentage of what it actually does achieve and it would probably take ten times as long to do so.
    The .dll files are very important for a computer and the windows operating system that drives a computer. If we imagine the operating system of a computer as a pyramid with the Windows system right at the top, then immediately below that would be the application programs we commonly use like Word, Excel and Internet Explorer etc.
    Below the application programs, 'driving' these programs would be Executable (.exe) files, each of which is responsible for one particular function of the programs.

Below these .exe files are the .dll files that help these .exe applications to achieve their objectives.
    So, Windows .dll files are a critically important part of the overall Windows 'picture' and, as such, they need to function correctly, in order that all the 'levels' of the pyramid above them can operate equally as well.