Cookie

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A '''cookie''', also known as an '''HTTP cookie''', '''web cookie''', or '''browser cookie''', is a string of text sent from a [[wikipedia:web server|web server]] to a user's browser that the browser is expected to send back to the web server in subsequent interactions. 
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A cookie has a few core attributes - the cookie value, the domain and path within which it is valid, and the cookie expiry.  There are other attributes as well that limit the cookie to HTTPS-only transactions, or hide it from JavaScript. 
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* The domain and path define the scope of the cookie - they tell the browser that cookies should only be sent back to the server for the given domain and path.
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* Cookies that do not have a specific expiration date and time are automatically deleted when the web browser is next closed.  Cookies with a set expiry time are considered '''persistent cookies''', while cookies without set expiry times are considered '''session cookies'''. 
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In online advertising, cookies generally store a unique identifier, and may contain information like what ads were recently seen (for [[frequency capping]]), when the cookie was created (to discover short duration identities), and other simple attributes. 
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[[Category:Glossary]]
 
[[Category:Glossary]]
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Latest revision as of 16:13, 12 April 2012

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