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Cookies

I have cookies

This website uses Google Analytics, so it makes use of cookies with your web browser.

What is a cookie?

A cookie, also known as an HTTP cookie, web cookie, or browser cookie, is a small piece of data sent from a website and stored in a user's web browser while a user is browsing a website. When the user browses the same website in the future, the data stored in the cookie can be retrieved by the website to notify the website of the user's previous activity. Cookies were designed to be a reliable mechanism for websites to remember the state of the website or activity the user had taken in the past. This can include clicking particular buttons, logging in, or a record of which pages were visited by the user even months or years ago.

Although cookies cannot carry viruses, and cannot install malware on the host computer, tracking cookies and especially third-party tracking cookies are commonly used as ways to compile long-term records of individuals' browsing histories — a major privacy concern that prompted European and US law makers to take action in 2011. Cookies can also store passwords and forms you filled in, such as credit cards numbers or your address. When a user accesses a Web site with a cookie function for the first time, a cookie is sent from server to the browser and stored with the browser in the local computer. Later when that user goes back to the same website, the website will recognize him because of the stored cookie with his information.

Other kinds of 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 under. Without such a mechanism, the site would not know whether to send a page containing sensitive information, or require the user to authenticate himself 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).

Source: http://en.wikipedia.org/wiki/HTTP_cookie

What your cookies do?

Google Analytics supports two JavaScript libraries (tags) for measuring website usage: analytics.js and ga.js. The following sections describe how each use cookies.

analytics.js – Cookie Usage

The analytics.js JavaScript library is party of Universal Analytics and uses a single first-party cookie containing an anonymous identifier used to distinguish users.

By default, this library sets cookies on the top level domain, excluding the leading dot, and sets the cookie path to the root level (/).
Note: The analytics.js library does not require setting cookies to transmit data to Google Analytics.
This library sets the following cookies:

Cookie Name: _ga
Expiration Time: 2 years
Description: Used to distinguish users.

Customization

Read the analytics.js Domains & Cookies developer guide to learn all the ways these default settings can be customized.

Read the Security and privacy in Universal Analytics document for more information about Universal Analytics and cookies.

ga.js – Cookie Usage

The ga.js JavaScript library uses first-party cookies to:

• Determine which domain to measure
• Distinguish unique users
• Remember the number and time of previous visits
• Remember traffic source information
• Determine the start and end of a session
• Remember the value of visitor-level custom variables

By default, this library sets cookies on the domain specified in the document.host browser property and sets the cookie path to the root level (/).

This library sets the following cookies:

Cookie Name:__utma
Default Expiration Time: 2 years from set/update
Description: Used to distinguish users and sessions. The cookie is created when the javascript library executes and no existing __utma cookies exists. The cookie is updated every time data is sent to Google Analytics.

Cookie Name:__utmb
Default Expiration Time: 30 mins from set/update
Description: Used to determine new sessions/visits. The cookie is created when the javascript library executes and no existing __utmb cookies exists. The cookie is updated every time data is sent to Google Analytics.

Cookie Name:__utmc
Default Expiration Time: End of browser session
Description: Not used in ga.js. Set for interoperability with urchin.js. Historically, this cookie operated in conjunction with the __utmb cookie to determine whether the user was in a new session/visit.

Cookie Name:__utmz
Default Expiration Time: 6 months from set/update
Description: Stores the traffic source or campaign that explains how the user reached your site. The cookie is created when the javascript library executes and is updated every time data is sent to Google Analytics.

Cookie Name:__utmv
Default Expiration Time: 2 years from set/update
Description: Used to store visitor-level custom variable data. This cookie is created when a developer uses the _setCustomVar method with a visitor level custom variable. This cookie was also used for the deprecated _setVar method. The cookie is updated every time data is sent to Google Analytics.

Customization

The following methods can be used to customize how cookies are set:
_setDomainName – Sets the domain to which all cookies will be set.
_setCookiePath – Sets the path to which all cookies will be set.
_setVisitorCookieTimeout – Sets the Google Analytics visitor cookie expiration in milliseconds.
_setSessionCookieTimeout – Sets the new session cookie timeout in milliseconds.
_setCampaignCookieTimeout– Sets the campaign tracking cookie expiration time in milliseconds.

Read the Tracking Multiple Domains guide to learn how to configure ga.js to measure user interaction across domains.

urchin.js – Cookie Usage

Historically, Google Analytics provided a JavaScript measurement library named urchin.js. When the newer ga.js library launched, developers were encouraged to migrate to the new library. For sites that haven not completed the migration, urchin.js sets cookies identically to what is set in ga.js. Read the ga.js cookie usage section above for more details.

Google Analytics for Display Advertisers – Cookie Usage

For customers that are using Google Analytics' Display Advertiser features, such as , a third-party DoubleClick cookie is used in addition to the other cookies described in this document for just these features. For more information about this cookie, visit the Google Advertising Privacy FAQ.

Source: https://developers.google.com/analytics/devguides/collection/gajs/cookie...

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