HTTP cookies are small blocks of data created by a web server while a user is browsing a website and placed on the user's computer or other device by the user's web browser.
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19 Facts About Internet cookies
2.
Authentication Internet cookies are commonly used by web servers to authenticate that a user is logged in, and with which account they are logged in.
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3.
Magic Internet cookies were already used in computing when computer programmer Lou Montulli had the idea of using them in web communications in June 1994.
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4.
The first use of Internet cookies was checking whether visitors to the Netscape website had already visited the site.
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5.
In particular, Internet cookies were accepted by default, and users were not notified of their presence.
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6.
RFC 2965 added a Set-Cookie2 header field, which informally came to be called "RFC 2965-style Internet cookies" as opposed to the original Set-Cookie header field which was called "Netscape-style Internet cookies".
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7.
Session Internet cookies are identified by the browser by the absence of an expiration date assigned to them.
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8.
Persistent Internet cookies are used for reasons such as keeping users logged into their accounts on websites, to avoid re-entering login credentials at every visit.
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9.
SuperInternet cookies can be a potential security concern and are therefore often blocked by web browsers.
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10.
Session Internet cookies only contain a unique session identifier, this makes the amount of personal information that a website can save about each user virtually limitless—the website is not limited to restrictions concerning how large a cookie can be.
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11.
Session Internet cookies help to improve page load times, since the amount of information in a session cookie is small and requires little bandwidth.
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12.
The Google search engine once used Internet cookies to allow users to decide how many search results per page they wanted to see.
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13.
Also, DuckDuckGo uses Internet cookies to allow users to set the viewing preferences like colors of the web page.
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14.
Session Internet cookies are intended to be deleted by the browser when the browser closes.
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15.
The advertiser can then use these Internet cookies to build up a browsing history of the user across all the websites that have ads from this advertiser, through the use of the HTTP referer header field.
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16.
Third-party Internet cookies can be blocked by most browsers to increase privacy and reduce tracking by advertising and tracking companies without negatively affecting the user's web experience on all sites.
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17.
Likewise, Internet cookies do not differentiate between multiple users who share the same user account, computer, and browser.
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19.
Furthermore, some systems, such as Tor, are designed to retain Internet cookies anonymity, rendering tracking by IP address impractical, impossible, or a security risk.
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