original_query: What is evercookie and how does it work?
query: What is evercookie and how does it work?
answer: Evercookie is a JavaScript API that identifies and reproduces intentionally deleted cookies on a user's browser. It works by using multiple browser storage mechanisms (HTTP cookies, Flash cookies, HTML5 storage, etc.) to persistently track users even if they delete some of the stored identifiers. If a user deletes some but not all identifiers, the website can retrieve the remaining identifier and restore it to the previously cleared storage.