| Cookie-Name | Description | Retention period |
| _et_coid | Cookie recognition (only with cookie activation) | 2 years and/or configurable |
| et_allow_cookies | Functional / required:
If data-block cookies are used, the API call _etracker.enableCookies() sets this cookie to "1" to indicate that etracker may set cookies. The cookie is set to "0" when _etracker.disableCookies() is called. | "0" - 50 years "1" - 480 days |
| isSdEnabled | Recognition of whether the visitor's scrolling depth is measured (only with cookie activation). | 24 hours |
| GS3_v | Set by the Optimizer Web Service. Contains the same Visitor ID as BT_pdc (only with cookie activation). | 1 year |
| BT_ctst | Is used only to detect whether or not cookies are activated in the visitor's browser (only if cookies are activated). | Duration of the session |
| BT_sdc | Contains Base64-encoded data of the current visitor session (referrer, number of pages, number of seconds since the start of the session, displayed smart messages in the session), which are used for personalization purposes (only if cookie is activated). | Duration of the session |
| BT_pdc | Contains Base64-encoded visitor history data (is customer, newsletter recipient, visitor ID, displayed smart messages) for personalization (only if cookie is activated). | 1 year |
| BT_ecl | Contains a list of project IDs for which the visitor is excluded. This cookie is set by the web service if the client has configured that not all visitors are assigned to a test, but only a certain fraction (only if cookie is activated). | 30 days |
| cntcookie | Functional / required
Exclusion from the Census (list of Account IDs) | 4 years |
| _et_coid | Cookie recognition (only with cookie activation). | 2 years and/or configurable |
| GS3_v | Set by the Optimizer Web Service. Contains the same Visitor ID as BT_pdc (only with cookie activation). | 1 year |
