Hello,

Welcome to LQ!!!

First of all I would like to inform you that you should better write text properly. We guys at LQ do not promote or rather dislike the use of chat or sms language in posts. As this is your first post it is fine but make sure you spell out your words correctly in following posts in LQ.

As far as your query is concerned x-windows,KDE,Gnome are different desktop environments and you can find the related information on them from the following link: http://en.wikipedia.org/wiki/Desktop_environment

At the bottom of this link you will find Gallery section in which you will find different desktop environments. Click on them one by one and you will get information on them.

I hope this helps.

Spell your words out, please. And no, we can't tell you "step-by-step" what their roles are. That's a very vague question, but in broad terms, X windows is the 'base' upon which most GUI based window managers (Gnome, KDE, etc.) run on top of.

And this sounds VERY much like a homework question.

Regarding homework and/or sundry information on linux...

Wikipedia has many useful, informative, and accurate articles on linux, its structure and component parts.

http://en.wikipedia.org/wiki/Linux

Notice all the handy hyperlinks.

http://en.wikipedia.org/wiki/Hyperlink

hello, the without the x window system, the system would not display what's called a gui, (graphical display interface). a gui is when you have taskbars, icons ect. without a gui, All you see on your monitor is plain text with a command line, this is called a cui (command line interface. once your system is running x windows, it can't run a gui right away, it needs to know how, such as with a desktop envirorment. unlike windows which only has one desktop envirorment, linux has many which the users may choose to use. the current most popular are gnome and kde. the desktop envirorment runs on the x window to give you a gui.

hope this helped

About dot com as a good intro to Linux.

http://linux.about.com/

I'd suggest you look it over and then come back here with slightly less--er--global questions.

LQ also has tutorials:

http://www.linuxquestions.org/linux/answers