Google Custom Search is a tool created by Google that allows you to customize the search engine to the needs of a specific website or store.
The integration allows for advanced search in the store using Google Custom Search. Thanks to this feature, the store's search engine also presents search results from Google, which include all indexed store pages.
Google Custom Search allows for up to 100 free queries per day, by default after exceeding 100 queries the module stops displaying query results for that day. You can pay for additional use of the google API in the google panel to increase the query limit up to 100,000.