Some advertisers and content owners are interested in understanding how their content is performing on YouTube and YouTube TV.
To provide this info, YouTube partners with Nielsen to measure content performance. Nielsen TV market research measures your viewing behavior.
- Learn about how info is collected and used or change your preferences on the Nielsen website.
- Learn about how usage is measured and our corresponding privacy policy in the YouTube Paid Terms of Service.
Follow the steps below to opt out or check your opt-out status, per Nielsen's website and policies:
You can limit ad tracking within your iPhone and iPad's settings page. To limit tracking, tap Settings 
Once you've opted out, your viewer demographic data will no longer be included in Nielsen TV measurement. We may regularly communicate with Nielsen to confirm member opt-out status.
TV devices
You can opt out of ads personalization by visiting Google Ad Settings.