SERP X-Ray as filters to allow you to fine-tune the results in the SERP. This helps when trying to create a specific type of content and certain results aren’t valid comparison. For example, you’re creating a written article but YouTube results are causing inaccurate SERP Stats regarding word count, Content Score, etc.
There are preset filters for Amazon, Facebook, Wikipedia, and YouTube. But you can also exclude specific sites if you wish.