How Google uses data when you use our partners' sites or apps
Many websites use Google technologies to improve their content and keep it free. When you visit a website that uses our advertising products (like AdSense), social products (like the +1 button), or analytics tools (Google Analytics), your web browser automatically sends certain information to Google. This includes, for example, the web address of the page that you're visiting and your IP address. We may also set cookies on your browser or read cookies that are already there.
Similarly, apps that partner with Google can send us information such as the name of the app and an identifier that helps us to determine which ads we've served to other apps on your device. If you are signed in to your Google Account, and depending on your Account settings, we may add that information to your Account, and treat it as personal information.
How we use the information sent by your browser
When you visit websites or use apps that use Google technologies, we may use the information we receive from those websites and apps to, for example:
Make ads more effective
Provide reports of ads activity to advertisers and websites hosting the ads, and to ensure payment to those website publishers
Help website and app owners using Google Analytics to understand how visitors engage with their sites or apps
Improve your Google+ experience
Detect and defend against fraud and other security risks to protect users and partners
Meet our legal duties
Improve our products
How you can control the information sent to Google
Here are some of the ways you can control the information that is shared by your web browser when you visit or interact with Google services on partners' sites across the web:
Ads Settings helps you control the ads by Google that you see across the web. You can learn how ads are selected for you, opt out of Ads Personalization, and block specific advertisers. Learn more about advertising.
If you are signed in to your Google Account, and depending on your Account settings, you can see and edit some of the information we collect from the sites and apps you have visited.
Google makes it easy for you to make recommendations for your friends - for example, by clicking the +1 button on content you like. Some of your +1s may show your name and Google+ profile photo in ads, but you can opt out if you don't want to appear in ads. You can also visit the +1 tab on your Google+ profile to review and manage all of your +1's. Learn more about how to get to your +1 tab.
Incognito mode in Chrome allows you to browse the web without recording webpages and files in your browser history. Cookies are deleted after you've closed all of your incognito windows and tabs, and your bookmarks and settings are stored until you delete them. Learn more about cookies.