A Mendix widget is a part of your Mendix app’s UI that enables functionality and interaction with users of the app. The widget is a page element used to display (visual) information on the page and to provide additional page interactions, like swipe controls or form-based fields.
The Mendix Platform provides several dozen widgets out of the box, and additional widgets are available from the Mendix Marketplace. A full overview of Mendix-supported widgets is shown on the Mendix Atlas UI site.
In addition to the widgets provided by Mendix, any developer can build additional custom widgets and upload these to the Mendix Marketplace. A custom widget can alter the interface, data, and images of the app as well as the way the app works. For details on creating a custom widget, see the Make Custom Widgets how-to’s in the Mendix Studio Pro How-to’s.