To override a core class method in Adobe Commerce, the<preference>XML node is used in thedi.xmlfile of a custom module. This node specifies that, for a given interface or class, Magento should use a different class (specified in the "type" attribute) whenever the original class is requested. This allows developers to extend or modify the functionality of core Magento components by substituting their own implementations in a way that is respectful of Magento's extension mechanisms.
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