Widget is a visual module component of a popup type that is displayed in the room. The main task of a widget is to display the main items to control SubDevice and to enable trasfer to a remote control (Remote) of SubDevice. For example, to control a media-player a volume slider or the Mute button can be placed on a widget for fast access to volume adjustment. A weather widget can display the current weather and the remote control can have weather forecast for 5 days.
Without a widget i3 lite module has no sense, as it has no graphic presentation in i3 lite projects.