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Widget toolkit
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<p>A widget toolkit, widget library, GUI toolkit, or UX library is a <a href="/facts/Library_(computing)/xRzL3P7q">library</a> or a collection of libraries containing a set of <a href="/facts/Graphical_control_element/SuVeScB2">graphical control elements</a> (called <i>widgets</i>) used to construct the <a href="/facts/Graphical_user_interface/wBlQFWDP">graphical user interface</a> (GUI) of programs. </p><p>Most widget toolkits additionally include their own <a href="/facts/Rendering_(computer_graphics)/YYxfnmAq">rendering engine</a>. This engine can be specific to a certain <a href="/facts/Operating_system/8XTuvMh2">operating system</a> or <a href="/facts/Windowing_system/nKYmkjP6">windowing system</a> or contain back-ends to interface with multiple ones and also with rendering APIs such as <a href="/facts/OpenGL/xQoMWePr">OpenGL</a>, <a href="/facts/OpenVG/3pX8NTYD">OpenVG</a>, or <a href="/facts/EGL_(API)/meQcl9rp">EGL</a>. The <a href="/facts/Look_and_feel/Uo3RcETT">look and feel</a> of the graphical control elements can be hard-coded or decoupled, allowing the graphical control elements to be <a href="/facts/Theme_(computing)/N08U51pq">themed</a>/<a href="/facts/Skin_(computing)/AY6fzl9H">skinned</a>. </p>