What is web cookie?

An HTTP cookie also called web cookie is a small piece of data sent from a website and stored on the user's computer by the user's web browser while the user is browsing.

An HTTP cookie (also called web cookie, Internet cookie, browser cookie, or simply cookie) is a small piece of data sent from a website and stored on the user's computer by the user's web browser while the user is browsing.

I will give you an example ,i search on some sites some weding costumes to go to a weding and i see in that site they was said me they was had cookie .After i go to facebook i see ads with the costumes i see on those sites .Cookie are some data that store what you look for etc

A cookie is a type of record that is created and stored in the browser when a user accesses a website.

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Cookies are usually small text files, given ID tags that are stored on your computer's browser directory or program data subfolders.
Cookies are created when you use your browser to visit a website that uses cookies to keep track of your movements within the site, help you resume where you left off, remember your registered login, theme selection, preferences, and other customization functions

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A cookie is a text file that a Web browser stores on a user's machine. Cookies are a way for Web applications to maintain application state.

Cookies are messages that web servers pass to your web browser when you visit Internet sites. Your browser stores each message in a small file, called cookie.

A Web cookie is a small file of data that a website sends to a user's browser, which stores it for a set amount of time. Cookies are used to store information about a user's visit to a website, which can facilitate future visits and increase the usefulness of the site.