A tool by Google to allow users to provide feedback on their services.
Google Feedback is an option available for almost every Google service to allow users to submit feedback regarding their products. The link to provide feedback on a service usually appears under the Settings icon called "Send feedback".
When using the tool, you can select parts of the page your would like to highlight to Google, and add a comment about what the highlighted part means.
Learn more about this service and see the status of those feedback that you have sent.