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I gladly give all information I have. dear farid. :D
I made this topic, because I wanted to show people, that the screen of a computer isn't so poring as just could only display Ms. Windows or Mac Os. There's actually many other desktop environments that most computers users have maybe never seen or heard about. KDE is one of them.
Answering to your question. Yes KDE indeed contains applications that can be used for organizing and editing photos. There's also a portion of most powerful free photo editing software under linux "digikam" available for KDE.
But KDE is more than one application. It's a collection of software needed to draw the desktop to the screen.. decorate windows... Play sound, show messages... To make using computer easy and joyful. It deals with many things.
In early ages, every computer program looked different. They had different file open dialogs and file save dialogs. Everything looked and worked differently. Therefore it was very difficult for users to learn how to use computer programs. And that's where programmers came up with deskdop environment. In very simple, this is basically a collection of software that deals with all communication between user and applications. So now example the file open dialog looks exactly same in all programs that run in a computer.
While in Microsoft windows the desktop environment is a part of operating system. It's all integrated into system. You can only chose some few opinions, like what colors the windows are,.... U can change some themes, but you actually cant switch the program that deals with all that off and use another desktop in the place of the one that Microsoft included..(Well actually u can run whatever other desktop in windows too, but it would just be additional desktop the windows original would continue run somewhere in background).
The Unix like systems have Desktop environment as a program that can be installed or uninstalled, or replaced with different one. And KDE is one of those programs.
As like in Microsoft Window and Mack, where you will get some additional software included with it. There is also a collection of software for KDE too. Like Games and a collection of educational software.. like a word game hangman example,.. And programs for Internet and for office work and so on.. And it's all free. :)