<type name="Magento\Framework\View\Element\UiComponent\DataProvider\CollectionFactory">
    <arguments>
        <argument name="collections" xsi:type="array">
            <item name="search_synonyms_grid_data_source"
                  xsi:type="string">
                Magento\Search\Model\ResourceModel\Synonyms\Grid\Collection
            </item>
        </argument>
    </arguments>
</type>

This is a type configuration.

This configuration is for the base area. Base area configurations will apply to all the sub-applications.

This configuration tells the Object Manager that when a user wants a Magento\Framework\View\Element\UiComponent\DataProvider\CollectionFactory object that the following arguments should be used in the foo object's constructor.

• $collections = [...items...];

<virtualType name="Magento\Search\Model\ResourceModel\Synonyms\Grid\Collection"
             type="Magento\Framework\View\Element\UiComponent\DataProvider\SearchResult">
    <arguments>
        <argument name="name" xsi:type="string">
            search_synonyms_grid_data_source
        </argument>
        <argument name="primaryFieldName" xsi:type="string">
            group_id
        </argument>
        <argument name="requestFieldName" xsi:type="string">
            id
        </argument>
        <argument name="mainTable" xsi:type="string">
            search_synonyms
        </argument>
        <argument name="resourceModel" xsi:type="string">
            Magento\Search\Model\ResourceModel\SynonymGroup
        </argument>
    </arguments>
</virtualType>

This is a virtual type configuration.

This configuration is for the base area. Base area configurations will apply to all the sub-applications.

This virtualType configuration tells the Object Manager when a user wants a virtual Magento\Search\Model\ResourceModel\Synonyms\Grid\Collection object that it should return a Magento\Framework\View\Element\UiComponent\DataProvider\SearchResult object.

This configuration tells the Object Manager that when a user wants a Magento\Search\Model\ResourceModel\Synonyms\Grid\Collection object that the following arguments should be used in the foo object's constructor.

• $name = "search_synonyms_grid_data_source";
• $primaryFieldName = "group_id";
• $requestFieldName = "id";
• $mainTable = "search_synonyms";
• $resourceModel = "Magento\Search\Model\ResourceModel\SynonymGroup";