the portion of an operating system that gives the programmer an interface for displaying within a window without concern for where on the screen the user has moved it or resized it and without concern [..]

A window manager is a program that acts as a graphical go-between for a user and an OS. It provides a GUI for the OS. Some OSes incorporate the window manager into their own internal code, but many do [..]

A window manager is a software utility found in most GUI-based software and applications that manages the overall alignment and layout of graphical windows. Window manager defines and controls the app [..]