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This cookie name is associated with Facebook which is used to identify the web browser being used to connect to Facebook independent of the logged in user and plays a key role in Facebook’s security and site integrity features.

This cookie identifies the browser connecting to Facebook. It is not directly tied to individual Facebook the user. Facebook reports that it is used to help with security and suspicious login activity, especially around detection of bots trying to access the service. Facebook also say the behavioural profile associated with each datr cookie is deleted after 10 days. This cookie is also read via Like and other Facebook buttons and tags placed on many different websites.

About this cookie’s host: This domain is owned by Facebook, which is the world's largest social networking service. As a third party host provider, it mostly collects data on the interests of users via widgets such as the 'Like' button found on many websites. This is used to serve targeted advertising to its users when logged into its services. In 2014 it also started serving up behaviourally targeted advertising on other websites, similar to most dedicated online marketing companies.

Related general information about datr:

Strictly Necessary Cookies

These cookies are essential in order to enable you to move around the website and use its features, such as accessing secure areas of the website. Without these cookies services you have asked for, like shopping baskets or e-billing, cannot be provided.

More about cookie classifications.

Third Party Cookies

If the host domain for a cookie is different to the one in the browser bar when it was downloaded, then it is a third party cookie.

They are usually placed in a website via scripts or tags added into the web page. Sometimes these scripts will also bring additional functionality to the site, such as enabling content to be shared via social networks.

For example, if you visit a site that has a YouTube video in one of its pages. This has been included by the website owner, using a piece of code provided by YouTube. YouTube will then be able to set cookies through this code, and know that you have watched that video, or even just visited the page the video is in.

Online advertising is the most common use of third party cookies. By adding their tags to a page, which may or may not display adverts, advertisers can track a user (or their device) across many of the websites they visit.

This allows them to build up a 'behavioural profile' of the user, which can then be used to target them with online ads based around their 'calculated' interests.

Use of cookies for this purpose is often seen as intrusive and an invasion of privacy. Such activity is one of the drivers behind the development of new privacy laws, especially the EU Cookie Law.

Persistent Cookie

As the name suggests, this type of cookie is saved on your computer so that when you close it down and start it up again, it can still be there.

Persistent cookies are created by giving them an expiry date. If that expiry date is reached, it will be destroyed by the computer. If the expiry date is not set then it is automatically a session cookie.

The expiry date will normally be saved as the time the cookie was first created plus a number of seconds, determined by the programmer who wrote the code for the cookie. However, there is no real limit on the expiry date - so it could be set to be 20 years in the future. In addition, if you revisit the website that served up the cookie, it may automatically place an updated version on your computer - with a revised future expiry date.

If you login into a website, then shut down your computer, start it up again, and go back to the website to find you are still logged in - then it is using a persistent cookie to remember you.

Persistent cookies are also used to track visitor behaviour as you move around a site, and this data is used to try and understand what people do and don't like about a site so it can be improved. This practice is known as Web Analytics. Since Google started providing its own analytics technology free of charge to website owners, almost all websites use some form of it - although there are also paid-for services available to rival Google's.

Analytics cookies are probably the most common form of persistent cookies in use today.

However, persistent cookies can also , oddly, have a shorter life span than some session cookies, as they can be coded to be destroyed within a second or two of being set, whereas a session cookie will always last until you close down your browser.