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What is a cookie?

Guide to cookies and how they are used on the Carbon Trust website.

What is a cookie?

A cookie is usually a small piece of data sent from a website and stored in your web browser while you are browsing a website. When you browse the same website in the future, the data stored in the cookie can be retrieved to notify the website of your previous activity.

What are cookies used for?

Cookies are used on more than 90 per cent of sites and serve many functions. For example, they can help us to remember your username and preferences, analyse how well our website is performing, or even allow us to recommend content we believe will be most relevant to you.

 Certain cookies contain personal information. For example, if you click on 'remember me' when logging in, a cookie will store your username. Most cookies won't collect information that identifies you, but will instead collect more general information, such as how users arrive at and use our websites or a user's general location.

These cookies are divided into the following four categories:

  • Necessary Cookies that are essential for the operation of our website
  • Functional Cookies that allow us to remember your preferences
  • Performance Cookies that analyse how our visitors use our websites and to monitor website performance
  • Tracking/Targeting Cookies that allow social media sites and our advertisers to serve you content we believe is relevant to you

Cookies on the Carbon Trust website:

Functional

Cookie Name Purpose
.click4assistance.co.uk _ga
_gat

This is set by our online live chat tool.

prod3ci.click4assistance.co.uk C4ATBChat_8eef12b3-78db-4ba1-afb9-8375ed6e016e

This is set by our online live chat tool.

.paypal.com LANG
x-csrf-jwt
X-PP-SILOVER

Used for PayPal purchasing system.

.paypalobjects.com PYPF

Used for PayPal purchasing system.

www.paypal.com Apache
AKDC

Used for PayPal purchasing system.

easywebrecruitment.formstack.com rgisanonymous
rguserid
rguuid
FormSpringFormSession1956170
FormSpringFormView1956170

We use a third party system to manage our web recruitment and job advertising systems.

www.carbontrust.com cookie-confirmed We use this cookie when you confirm that you accept cookies from our site.
www.carbontrust.com ASP.NET_SessionId This session cookie is set by our website to help it carry out functions.

Performance

Cookie Name Purpose
.carbontrust.com __utma
  __utmb
__utmc
__utmz

Cookies set by the Google Analytics service to enable website owners to track visitor behaviour and measure site performance. The cookies collect information in an anonymous form, including the number of visitors to the site, where visitors have come to the site from and the pages they visited.  This information can be used in the future to improve the site content.

Google's terms of service and privacy policy are available here: http://www.google.com/intl/en_uk/analytics/tos.html

www.carbontrust.com PRUM_EPISODES This cookie is set by the Pingdom web statistics tool, and gives information about our site's health.
www.carbontrust.com __atuvc This cookie is associated with the AddThis social sharing widget which is commonly embedded in websites to enable visitors to share content with a range of networking and sharing platforms. It stores an updated page share count.
www.carbontrust.com __atuvs This cookie ensures that the updated AddThis counter is displayed to the user if a page is shared with social services.
.pingdom.net __cfduid

Web statistics tool provided by the Pingdom service which used to monitor how quickly pages load and to ensure our website remains fast.

www.youtube.com VISITOR_INFO1_LIVE Tries to estimate user's bandwidth on pages with integrated YouTube videos.

Tracking/targeting

Cookie Name Purpose
ad.360yield.com tuuid
um
umeh

Used for targeting/advertising.

.adnxs.com anj
sess
uuid2

This set of cookies is used for online display advertising targeting by AppNexus.

More information on the cookies set by AppNexus and how to opt out are on the website http://www.appnexus.com/en/company/platform-privacy-policy

.adtech.de CfP
JEB2

This set of cookies is used for advertising.

.adtechus.com CfP
JEB2

This set of cookies is used for advertising.  These cookies allow our ad service provider to monitor the effectiveness of adverts (e.g. by using statistical analysis cookies) and make adverts more relevant to you (e.g. you may get ads from your local country or in your local country’s language).

More information on the cookies set by Ad Tech and how to opt out are on the website http://www.adtech.info/cookie_opt-out.

.bidswitch.net c

Regulates synchronisation of user identification and exchange of user data between various ad services.

.bing.com MUID

This cookie is widely used my Microsoft as a unique user identifier. It can be set by embedded Microsoft scripts. Widely believed to sync across many different Microsoft domains, allowing user tracking.

.dps.bing.com MR

Used for targeting/advertising.

.cardlytics.com mv3

Used for targeting/advertising.

.casalemedia.com CMID
CMPS
CMSC
CMST
CMDD
CMRUM3

Used for targeting/advertising.

.contextweb.com V
pb_rtb_ev
sto-id-20480-bh

Used for targeting/advertising.

.criteo.com uid
eid

Used for targeting/advertising.   Criteo is an advertising network that specializes in retargeting.

.doubleclick.net test_cookie
id

Used for targeting/advertising.   Doubleclick is a advertising system. Used by Google AdSense to register and report the website user's actions after viewing or clicking one of the advertiser's ads with the purpose of measuring the efficacy of an ad and to present targeted ads to the user.

.exelator.com DNT

Used for targeting/advertising.  

.lijit.com ljt_reader
_ljtrtb_15

Used for targeting/advertising.  Collects data related to reader interests, context, demographics and other information on behalf of the Lijit platform with the purpose of finding interested users on websites with related content.

lijit.com _ljtrtb_#

Collects data related to reader interests, context, demographics and other information on behalf of the Lijit platform with the purpose of finding interested users on websites with related content.

.liverail.com lr_uid
lr_uds

Used for targeting/advertising.

.netmng.com evo5

Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded, with the purpose of displaying targeted ads.

.pixel.rubiconproject.com rpx

Used for targeting/advertising.

pixel.rubiconproject.com c

Used for targeting/advertising.

.rubiconproject.com rpb
put_3176
khaos

Used for targeting/advertising.

.smartadserver.com pid
TestIfCookieP
csync

Used for targeting/advertising.

.spotxchange.com partner-1448473228_cc6e-0

Used for targeting/advertising.

.swid.switchads.com ADJG

Used for targeting/advertising.

bluekai.com bkdc
bku

Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.

contextweb.com pb_rtb_ev
sto-id-20480-bh

Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.

crwdcntrl.net _cc_id

Collects anonymous statistical data related to the user's website visits, such as the number of visits, average time spent on the website and what pages have been loaded. The purpose is to segment the website's users according to factors such as demographics and geographical location, in order to enable media and marketing agencies to structure and understand their target groups to enable customised online advertising.

doubleclick.net test_cookie

Used to check if the user's browser supports cookies.

pubmatic.com KRTBCOOKIE_#
PUBMDCID
PUBRETARGET

Registers a unique ID that identifies the user's device during return visits across websites that use the same ad network. The ID is used to allow targeted ads.

www.youtube.com PREF Registers a unique ID that is used by Google to keep statistics of how the visitor uses YouTube videos across different websites.
www.youtube.com YSC Registers a unique ID to keep statistics of what videos from YouTube the user has seen.
www.youtube.com yt-remote-device-id Used by YouTube - unclassified
addthis.com bt2
di2
dt
loc
uid
um
uvc
vc

This set of cookies are used for our share page feature. These buttons allow users to share pages but also allow social media outlets to track users.

More information on the cookies set by AddThis and how to opt out are on the AddThis website http://www.addthis.com/privacy

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