Cookies

Review: A cookie is a small piece of information left on a visitor's computer by a website, via a web browser. Cookies are used to personalize a user's web experience with a website. It may contain the user's preferences or inputs when accessing that website. A user can customize their web browser to accept, reject, or delete cookies. Cookies can be set and modified at the server level using the Set-Cookie HTTP header, or with JavaScript using document.cookie.

https://developer.mozilla.org/en-US/docs/Glossary/Cookie