hacker.org

WHAT DOES COMMAND PROMPT USE FOR??
CAN ANY ONE TELL ME..(i`m mean something extraordinary)

Every thing .. I guess

Well SOYA, in the "facebook hack" thread you offered, in tiny letters, to teach someone how to hack, yet you claim not to know the usefulness of the command prompt? *sigh*

Well, for starters, I am by no means even adept on the subject, but I will try to give you the general idea. Most cracking tools, network reconnaissance tools (like nmap, although this is a particular exception - I'll get to it later) and the like are still console-based.
If by Command Prompt you mean Windows, then you can perform actions that usually take you a bit of clicks, like obtaining your ip address (you can get it by typing ipconfig on the command line, or at the properties of the network connection at the GUI), or even commands that can only run at the console, like ping and net (I do not know if there is a graphical interface for such commands, so anyone correcting is welcome).
If you mean Linux, then it is called a shell, (the BASH shell is quite popular) and if you do mean that, then I truly refuse to even try explaining the obvious. If anyone else has the courage, please do so.

For the most popular tools like nmap, special graphical interfaces have been developed (like zenmap) which just make the various options into check boxes and drop-down menus, but they are still based on the very console-based program to get the job done. Some of them will display the results in a more eye-candy manner, but frankly the result for an experienced user is just the same, or lower. Most users who tend to get real intimate with the inner workings of their computer tend to use the command line extensively though. Most linux users do. As for windows, there are guys who still use the command line to do certain jobs (seriously, when you have a folder of 193 text files and 234 others, and you want to delete the text files, is it easier to go the graphical way or to go the del *.txt // rm *.txt way? The wildcard chars can get some serious job seriously fast).
Anyone else to add to that matter?

Correct me if i am wrong, ( CodeX lol ), i believe the command prompt is an engine built within the OS the operate with direct commands instead of GUI.

cmd.exe/command.com come with windows but aren't actually a part of the OS as such but are just shells, they are normal programs that are made so you can interact with the OS using simple commands, so you could make your own program that would do the same by making calls to OS functions via the Windows API/ABI.