You may opt-out of Google Analytics for Display Advertising by visiting Ad Settings.</p> Web Beacons and Pixels <p>The Smithsonian also collects non-personally identifiable information through the use of tracking pixels that appear on our pages. A tracking pixel is a transparent graphic image (usually 1 pixel x 1 pixel) that is placed on a web page and, in combination with a cookie, allows us to collect information regarding the use of the web page that contains the tracking pixel.</p> <p>We use tracking pixels to trigger ads on participating websites based on activity tracked from the browser on a device used to visit Smithsonian Websites.