What type of widget is primarily used for displaying or editing a single record?

The correct choice is the Form Widget, as it is specifically designed to handle user input and display data related to a single record. In the context of web applications, forms are essential for collecting information from users, such as inputting data or editing existing records.

The Form Widget allows for various data types and provides necessary functionalities like validation, submission controls, and can be connected to the application's data model. This is crucial for ensuring that data is accurately captured and can be processed or stored appropriately. Forms offer a user-friendly interface for editing fields, and they can include multiple field types like text fields, dropdowns, checkboxes, and more, making them versatile for a range of input requirements.

Other widgets like Expression, Label, and Text Widgets serve different purposes. The Expression Widget is meant for displaying dynamic content without the capability for user input, while the Label Widget simply displays static text and is not interactive. The Text Widget is primarily used for multi-line text input but does not have the structured capabilities of a Form for managing a whole record. Therefore, the Form Widget stands out as the most suitable option for the task of displaying or editing a single record.