# An introduction to cookies Adhese uses cookies to support a number of Adhese ad-serving features. **Cookies** are small packets of data that a server sends to a browser's directories when a visitor opens a web page. When the visitor subsequently accesses the same website, the browser retrieves the cookie and returns it to the relevant server. The browser will only return a cookie to the server that sent it in the first place.

For user privacy concerning cookies, see [User privacy GDPR. ](https://documentation.adhese.org/books/adhese-setup-and-implementation/page/user-privacy-and-gdpr)More on the privacy policy of Adhese is available on [our website](https://adhese.eu/privacy-policy/).

# Adhese & cookies ## Why does Adhese set cookies? Adhese uses a single cookie, called `adhese2`, for data analysis and frequency capping. The adhese2 cookie contains a unique value to identify a previous visitor but does not collect any personally identifiable information. This cookie enables publishers to keep track of, for example, the number of unique visitors and the number of times a specific ad has been served to a particular visitor. In addition, Adhese uses cookies for behavioural targeting. For example, if you want to target visitors who have expressed an interest in sports, you can place a sports cookie in your visitor's browser. ## How does Adhese set cookies? The Adhese Ad Server sends a cookie to a browser when a visitor opens a web page of a publisher for the first time. More specifically, Adhese sends the `adhese2` cookie when it receives the first initial request from the browser.