The identifier an engine creates and assigns to an item. The value in this column depends on the report you're viewing. For example on the Keywords tab, this column displays each keyword's engine ID. On the Ad groups tab, the column displays each ad group's engine ID.
You can also view engine IDs in the following columns:
Add this column to a report
Navigate to an advertiser and click the Engine accounts, Campaigns, Ad groups, Ads, or Keywords tab.
Click the Columns button above the performance summary graph.
Next to Available columns, type the column name in the search box and press the Enter key.
Click + next to the column name in the Available columns list.