and window manager.
KWin is a window manager for the X Window System and is currently in the process of becoming a Wayland compositor. It is released as part of  KDE Plasma 5 for which it is the default window manager. KWin can also be used on its own or with other desktop environments.
KWin 5.x depends on
KDE Frameworks 5. KWin 4.x depended on KDE Platform 4, which was a monolithic library. KWin 3.x and earlier depended on KDELibs.
KWin can be configured by scripting using
QML or QtScript, both of which are based on ECMAScript.
Extended support for themes and window effects.
Improved support for the extended ICCCM standards from freedesktop.org.
Compositing support and Compiz-like effects.
Maximizing and tiling by snapping to the screen-edges, grouping and tabbing.
Tiling. (removed in version 4.10)
Incompatible API change.
Last release based on KDE Platform 4. Experimental Wayland support.
First release based on KDE Frameworks 5 and Qt 5.
Released February 2018, KWin/X11 got feature frozen, meaning no new X11 specific features will be added. Martin Flöser stated that new features are easy and straight forward with the Wayland back-end, but require considerably more development to add the same feature to the X11 back-end.
There are many
window decorations for KWin, including the current default Breeze (shown below), the previous default Oxygen, Microsoft Windows-like Redmond, and Keramik.
KWin with the Breeze window decoration.
Currently available compositing backends include XRender, OpenGL 1.2, OpenGL 2.0, OpenGL 3.1
and OpenGL ES 2.0. 
Screenshot showing the cover switch effect in KWin for KDE 4.1.
As of KDE 4.3 the following effects are built-in:
Inverts the color of the desktop and windows
A screen magnifier that looks like a fish eye lens
Magnify the section of the screen that is near the mouse cursor
Makes the entire desktop look sharper
Helps locate the centre of the screen when moving a window
Display a mouse cursor locating effect when activated
Magnify the entire desktop
Make windows explode when they are closed
Make windows smoothly fade in and out when they are shown or hidden
Fade between virtual desktops when switching between them
Close windows fall into pieces
Highlight the appropriate window when hovering over taskbar entries
Smoothly fade to the desktop when logging in
Desaturate the desktop when displaying the logout dialog
Simulate a magic lamp when minimizing windows
Animate the minimizing of windows
Allows you to draw lines over your desktop
Animate the appearance of windows
Make modal dialogues smoothly fly in and out when shown or hidden
Slide windows across the screen when switching virtual desktops
Sliding animation for Plasma Popups
Display window thumbnails when hovering over taskbar entries
Display window thumbnails on the edge of the screen
Make windows translucent under different conditions
Deform windows while they are moving
Simulate snow falling on the desktop
Darkens the parent windows of the currently active dialogue
Darken inactive windows
Dim screen for administrator mode
Darkens the entire screen when requesting root privileges
Slide back windows losing focus
Show kwins performance in the corner of the screen
Highlight areas of the desktop that have been recently updated
Display thumbnails of windows in the alt+tab window switcher
Apply a Cover Flow-like effect to the alt+tab window switcher
Present each desktop as the facet of a cube
Desktop Cube Animation
Animate desktop switching with a cube
Zoom out so all desktops are displayed side-by-side in a grid
Flip through windows that are in a stack for the alt+tab window switcher
Zoom out until open windows can be displayed side by side
Effect to outline geometry while resizing a window
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"KDE Ships Plasma 5.5 Release". KDE. 2015-12-08.
"Development/Tutorials/KWin/Scripting" . Retrieved . June 19, 2013
"KDE SC 4.4.0 Caikaku Release Announcement" . Retrieved . June 13, 2010
"KDE Software Compilation 4.5 Beta2 Release Announcement" . Retrieved . June 13, 2010
"Scripting Update Notes". March 6, 2012 . Retrieved . June 19, 2013
"Plasma Workspaces 4.11 Continues to Refine User Experience". August 14, 2013 . Retrieved . July 1, 2015
"New Plasma brings a cleaner interface on top of a new graphics stack". July 15, 2014 . Retrieved . July 1, 2015
"KWin/X11 is feature frozen". 2018-01-16.
Martin Gräßlin (June 18, 2013). "What we did in KWin 4.11".
Martin Gräßlin (February 18, 2011). "KWin Embraces New Platforms with OpenGL ES 2.0 Support". KDE. KDE.NEWS . Retrieved . April 9, 2011
article "KWin" is from Wikipedia. The list of its authors can be seen in its historical and/or the page Edithistory:KWin. Articles copied from Draft Namespace on Wikipedia could be seen on the Draft Namespace of Wikipedia and not main one.