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The search queries reporting allows you to assess the original search queries which resulted when your Google Ads showed in front of an audience. When you see the actual queries about how users search for your products or services, you can refine your Google Ads keyword list as well as your negative keywords. 

This way you will be able to reach more audiences who are interested in your products or services and reduce irrelevant clicks on your ads. You need to look at the search query report on a regular basis to optimize your campaigns.