Update
Magento\Widget\Model\Layout\Update
What it does
This model represents layout updates stored in the database for widgets in Magento 2.
Developers use this class to programmatically manage widget layout XML updates, including creating, reading, updating, and deleting layout modifications associated with specific handles, stores, and themes.
It provides magic getter/setter methods for accessing layout update properties like XML content, handle names, store IDs, and theme IDs.