A layout is a visual grouping of widgets that appear on a display positioned within a room. A layout shows widgets in a variety of placements and sizes. There are two types of layouts: room layout and full screen layout.
A widget is a graphical item that is part of a layout. XEdit provides several types of widgets such as clock, video, audio meter, UMD, time code and composite.
A widget library is a collection of predefined widgets. Widgets from a library can be used to help create a layout. New composite widgets can be added to custom libraries.