Google uses cookies for advertising, including serving and rendering ads, personalizing ads (depending on your settings at
myadcenter.google.com and
adssettings.google.com/partnerads), limiting the number of times an ad is shown to a user, muting ads you have chosen to stop seeing, and measuring the effectiveness of ads.
The ‘NID’ cookie is used to show Google ads in Google services for signed-out users, while the ‘ANID’ and ‘IDE’ cookies are used to show Google ads on non-Google sites. If you have personalized ads enabled, the ‘ANID’ cookie is used to remember this setting and lasts for 13 months in the European Economic Area (EEA), Switzerland, and the United Kingdom (UK), and 24 months everywhere else. If you have turned off personalized ads, the ‘ANID’ cookie is used to store that setting until 2030. The ‘NID’ cookie expires 6 months after a user’s last use. The ‘IDE’ cookie lasts for 13 months in the European Economic Area (EEA), Switzerland, and the United Kingdom (UK), and 24 months everywhere else.
Depending on your ad settings, other Google services like YouTube may also use these and other cookies and technologies, like the ‘VISITOR_INFO1_LIVE’ cookie, for advertising.
Some cookies and other technologies used for advertising are for users who sign in to use Google services. For example, the ‘DSID’ cookie is used to identify a signed-in user on non-Google sites and to remember whether the user has agreed to ad personalization. It lasts for 2 weeks.
Through Google’s advertising platform, businesses can advertise in Google services as well as on non-Google sites. Some cookies support Google showing ads on third-party sites and are set in the domain of the website you visit. For example, the ‘_gads’ cookie enables sites to show Google ads. Cookies that start with ‘_gac_’ come from Google Analytics and are used by advertisers to measure user activity and the performance of their ad campaigns. The ‘_gads’ cookies last for 13 months and the ‘_gac_’ cookies last for 90 days.
Some cookies and other technologies are used to measure ad and campaign performance and conversion rates for Google ads on a site you visit. For example, cookies that start with ‘_gcl_’ are primarily used to help advertisers determine how many times users who click on their ads end up taking an action on their site, such as making a purchase. Cookies used for measuring conversion rates are not used to personalize ads. ‘_gcl_’ cookies last for 90 days.
See more information about cookies used for advertising
here.