Kivy is a framework for developing multi-touch GUI apps in Python with rich built-in widgets.This tutorial covers complex widgets in Kivy like Bubble, DropDown, FileChooser, Popup, Spinner, RecycleView, TabbedPanel, VideoPlayer, and VKeyboard.You can enhance your Kivy apps with advanced features using these widgets.The tutorial starts with building an outline Kivy app and progresses to Spinner for option selections.DropDown is introduced for providing a menu component with multiple options.File access is facilitated using FileChooser for describing and browsing file systems.Quick dialogs can be created with the Popup widget for modal dialogs.Bubble is discussed for contextual popups, tooltips, or chat applications.RecycleView efficiently displays data by recycling views, avoiding a widget for every item.TabbedPanel organizes content into tabs, improving navigation and space utilization.