What is Invalid Click and How Google determines the invalid clicks?

What is Invalid Click and How Google determines the invalid clicks?

Invalid traffic includes any clicks or impressions that may artificially inflate an advertiser's costs or a publisher's earnings. Invalid traffic covers intentionally fraudulent traffic as well as accidental clicks.

Invalid traffic includes any clicks or impressions that may artificially inflate an advertiser's costs or a publisher's earnings. Invalid traffic covers intentionally fraudulent traffic as well as accidental clicks. ... Clicks or impressions generated by publishers clicking their own live ads.