cookie is a collection of data – typically small –  provided by a web page, downloaded by your browser, and stored on your machine. The next time your browser requests a page from that same domain, all cookies that were last provided by that domain are included with the page request.

For example, you visit somerandomservice.com for the first time. When the initial page is downloaded, included with that page might be some data in a cookie, which says “SeenFirstPage=1.” That data – the domain somerandomservice.com and its cookie “SeenFirstPage=1” – is stored by your browser on your machine. The next time you visit any page on somerandomservice.com, your browser includes the “SeenFirstPage=1” cookie with the request. In this example, the site may then elect to perhaps present a different page, knowing you’ve seen the first page.

The actual contents and usage of cookies is not defined, and may be anything as defined by the website that uses them.

In practice, cookies are frequently used to store information that prevents people from needing to log in over and over for every single page on a site that a requires a log in (such as an email service), to maintain the state of a shopping cart when shopping in an online store, and to provide a more seamless experience on feature-rich web sites.

cookie (Wikipedia)

Chocolate chip cookies
Alternative namesBiscuit
CourseSnack, dessert
Place of originPersia, 7th century AD
Serving temperatureOften room temperature, although they may be served when still warm from the oven

A cookie is a baked or cooked food that is typically small, flat and sweet. It usually contains flour, sugar, egg, and some type of oil, fat, or butter. It may include other ingredients such as raisins, oats, chocolate chips, nuts, etc.

In most English-speaking countries except for the United States, crunchy cookies are called biscuits. Many Canadians also use this term. Chewier biscuits are sometimes called cookies even in the United Kingdom. Some cookies may also be named by their shape, such as date squares or bars.

Biscuit or cookie variants include sandwich biscuits, such as custard creams, Jammie Dodgers, Bourbons and Oreos, with marshmallow or jam filling and sometimes dipped in chocolate or another sweet coating. Cookies are often served with beverages such as milk, coffee or tea and sometimes "dunked", an approach which releases more flavour from confections by dissolving the sugars, while also softening their texture. Factory-made cookies are sold in grocery stores, convenience stores and vending machines. Fresh-baked cookies are sold at bakeries and coffeehouses, with the latter ranging from small business-sized establishments to multinational corporations such as Starbucks.

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