179 days HTTP Cookie IDE Google Used by Google DoubleClick to register and report the website user's actions after viewing or clicking one of the advertiser's ads with the purpose of measuring the efficacy of an ad and to present targeted ads to the user. 1 year HTTP Cookie MUID Microsoft Used widely by Microsoft as a unique user ID. The cookie enables user tracking by synchronising the ID across many Microsoft domains. 1 year HTTP Cookie pagead/1p-conversion/# Google Collects data on visitor behaviour from multiple websites, in order to present more relevant advertisement - This also allows the website to limit the number of times that they are shown the same advertisement.