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HTTP cookie

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. Cookies were designed to be a reliable mechanism for websites to remember stateful information (such as items added in the shopping cart in an online store) or to record the user's browsing activity (including clicking particular buttons, logging in, or recording which pages were visited in the past). They can also be used to remember arbitrary pieces of information that the user previously entered into form fields such as names, addresses, passwords, and credit card numbers.

Cookies perform essential functions in the modern web. Perhaps most importantly, authentication cookies are the most common method used by web servers to know whether the user is logged in or not, and which account they are logged in with. Without such a mechanism, the site would not know whether to send a page containing sensitive information, or require the user to authenticate themselves by logging in. The security of an authentication cookie generally depends on the security of the issuing website and the user's web browser, and on whether the cookie data is encrypted. Security vulnerabilities may allow a cookie's data to be read by a hacker, used to gain access to user data, or used to gain access (with the user's credentials) to the website to which the cookie belongs (see cross-site scripting and cross-site request forgery for examples).

Tracking cookies, and especially third-party tracking cookies, are commonly used as ways to compile long-term records of individuals' browsing histories – a potential privacy concern that prompted European and U.S. lawmakers to take action in 2011. European law requires that all websites targeting European Union member states gain "informed consent" from users before storing non-essential cookies on their device.

Google Project Zero researcher Jann Horn describes ways cookies can be read by intermediaries, like Wi-Fi hotspot providers. He recommends to use the browser in incognito mode in such circumstances.



Source: HTTP cookie
Harry Styles
The Last Ship (TV series)
Ron Jeremy
Africa
Akbar
Quantico (TV series)
Cars (film)
Santa Claus's reindeer
Roger Federer
Tamil Nadu
Eddie Redmayne
Laura Haddock
Goa
Rajinikanth
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Tibet
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James Rodríguez
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The Big Bang Theory (season 10)
All Eyez on Me (film)
Herpes simplex
Vanna White
Fidel Castro
Scott Eastwood
Mike Myers
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Mia Goth
Star Wars: The Last Jedi
Maggie Q
Wiki
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Taliban
Video game
Anna Faris
List of longest-running scripted U.S. primetime television series
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Finn Bálor
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Bright (film)
Computer
Noel Gallagher
John Locke
Hinduism
Adele
Ayn Rand
Goods and Services Tax (India)
Charo
Cate Blanchett
Roald Dahl
World Series
Melania Knauss
Inferno (Dante)
Jackfruit
PewDiePie
Dancing with the Stars (U.S. season 24)
Alan Turing
Robert Lewandowski
Kid Rock
Oxygen
List of trigonometric identities
Anthony Hopkins
The Lord of the Rings
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Slovenia
Yolanda Saldívar
Ana de Armas
Laos
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Elijah Blue Allman
Opinion polling for the French presidential election, 2017
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Richard Gere
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Matthew McConaughey
Man of Steel (film)
Mary Tyler Moore
R. Kelly
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UFC 210
Kaatru Veliyidai
Yahoo!
Xi Jinping
James McAvoy
Richard Dreyfuss
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Zeus
2016 NFL Draft
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Wi-Fi
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Elijah Wood
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Tina Fey
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Bad Credit
Joe Manganiello
Saw (franchise)
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Suriya
Dzhokhar Tsarnaev
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Circulatory system
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Sebastián Marroquín
Scoville scale
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List of films considered the worst
Bhutan
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Hoda Kotb
Agile software development
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Ludwig van Beethoven
Juventus F.C.
Shailene Woodley
Scandal (season 6)
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Aristotle
Avril Lavigne
Shilpa Shinde
Curaçao
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Madhuri Dixit
Mahesh Babu
Normandy landings
Bangladesh
Detroit
Uganda
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Tardigrade
Star Trek: The Next Generation
Alexis Bledel
White House
Injustice 2
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Lindsey Stirling
List of Stanley Cup champions
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LaMelo Ball
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Shraddha Kapoor
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Tamannaah
Akon
Academy Award for Best Actor
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Porno (novel)
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2004 Indian Ocean earthquake and tsunami
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Anonymous (group)
Cali Cartel
Gerard Piqué
List of countries by life expectancy
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Human Development Index
Running Man (TV series)
Betty White
The Miz
European Union
House (TV series)
Sebastian Stan
Jhené Aiko
Frontier (2016 TV series)
Apartheid
Timothy McVeigh
Jason Sudeikis
Bob Barker
Robin Williams
Olivia de Havilland
George Washington
Jainism
The Wire
Sebastian Gorka
Jada Pinkett Smith
Patrick Dempsey
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