KDE is an international community that develops free software. It produces a desktop environment, a multitude of applications and development infrastructure for various operating systems such as GNU / Linux, Mac OS X, Windows, etc. The main software components produced by KDE are grouped under the name KDE Frameworks, KDE Plasma, and KDE Applications.
KDE applications are translated into approximately 75 languages  and are built with the principles of ease of use and modern accessibility in mind. KDE Applications works completely natively on GNU / Linux, BSD, Solaris, Windows, and Mac OS X.
The "K" originally stood for the word "Kool",  but its meaning was later dropped. The other two acronyms "DE" describe its usefulness as a Desktop Environment.
The community mascot is a small dragon named Konqi.
Philosophy and usage
The KDE environment is based on the principle of customization; all KDE components can be configured to a greater or lesser extent by the user. The most common options are mostly accessible from menus and configuration dialogs. Advanced users can choose to edit configuration files manually, in some cases gaining more control over system behavior.
The appearance of the KDE software is configurable on several levels. Both the window manager (called KWin) and the controls (buttons, menus, etc.) use interchangeable "styles", which define every aspect of their appearance. It is for this reason that the KDE environment does not maintain a single appearance between versions, but opts for the one most widely accepted at the time of each new release.
The KDE desktop environment does not behave in a predefined way, but allows the user to tailor the system to their liking and comfort. This does not prevent it from being easy to use for new users, a detail that is given great importance.
The KDE project was started in October 1996 by the German programmer Matthias Ettrich,  who sought to create a unified graphical interface for Unix systems. In his early days he imitated CDE (Common Desktop Environment), a desktop environment used by various Unixes.
KDE 1.0 was released on July 12, 1998. This version contained a panel (task bar and application launcher), a desktop on which to leave icons, a file manager (Kfm) and a large number of utilities.
In November 1998, the Qt suite of tools was further licensed under the free open source Q Public License (QPL).
The same year, the KDE Free Qt foundation was created  to guarantee that Qt would enter a variant of the liberal BSD license in case Trolltech ceased to exist or did not release any free or open source version of Qt for 12 months.
The debate continued on compatibility with the GNU General Public License (GPL), so in September 2000, Trolltech released the Unix version of the Qt libraries under the GPL, in addition to the QPL, which eliminated Free Software concerns. Foundation.
Trolltech continued to demand licenses for the development of proprietary software with Qt.
KDE 2.0, released on October 23, 2000, was almost completely rewritten,  introducing significant technological improvements. Among them DCOP (Desktop Communication Protocol), KIO, an I / O library, KParts, which is an object model component, which allows an application to integrate another within itself, and KHTML, an engine HTML rendering used by Konqueror, which in addition to being a web browser is a file manager. In addition, in this version the visual aspect of the desktop has been partially improved