Since GTK version 3.0, all rendering is done using Cairo. Starting with version 2.8, released in 2005, GTK began the transition to using Cairo to render most of its graphical control elements widgets. Several display engines exist which try to emulate the look of the native widgets on the platform in use. GTK can be configured to change the look of the widgets drawn this is done using different display engines. There is also an HTML5 back-end named Broadway. While GTK is mainly for windowing systems based on X11 and Wayland, it works on other platforms, including Microsoft Windows (interfaced with the Windows API), and macOS (interfaced with Quartz). GTK is an object-oriented widget toolkit written in the programming language C it uses GObject, that is the GLib object system, for the object orientation. The GTK library contains a set of graphical control elements ( widgets) version 3.22.16 contains 186 active and 36 deprecated widgets.
GDK contains back-ends to X11, Wayland, Broadway ( HTTP), Quartz, and GDI and relies on Cairo for the rendering.
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