What technology enables a website's ads to follow you to other sites after you visit?

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Cookies are small pieces of data stored on the user's computer by the web browser while browsing a website. They play a crucial role in tracking user behavior across multiple sites. When you visit a website, cookies can be created to remember your preferences, login status, and other details. This information can then be utilized by advertisers to display targeted ads based on your browsing history.

When you navigate away from the original site to other pages on the internet, those cookies can inform ad networks about your previous visits, allowing ads to follow you to different sites. This targeted marketing strategy is referred to as retargeting, and it relies heavily on the data collected from cookies.

The other options do not perform this specific function. Cache refers to storing web pages and resources temporarily to speed up loading times, while web tracking encompasses various methods that may not specifically involve cookies. Session storage allows data to be stored for the duration of the page session only and is cleared once the page is closed, thus not applicable to persistent tracking.