i cant make head nor tail of it. (i would have thought "off")
from my advertising preferences....
"3rd Party Cookies Not Enabled: Your Chrome browser blocks cookies used for behavioural advertising purposes. To successfully switch off behavioural advertising these cookies need to be enabled. You may wish to enable these cookies or prefer to leave them disabled. See our opt-out help page opt-out help page for more information. If you choose to continue without Third Party cookies enabled, some of the listed companies may not retain your preferences correctly."
If you want ads which aren't specific to your searches, then turn it off. If you want ads specific to your searches, switch it on. If you don't want ads at all.....