Measure used to gauge the effectiveness of a site in retaining its users. Usually measured by the duration of the visit.

An organisation which sells advertising on behalf of other media owners. Sales houses typically retain a percentage of the revenue they sell in exchange for their services. These organisations may combine a number of websites together and sell them as different packages to advertisers.

Information placed on a visitor’s computer or mobile by a web server that can be stored or retrieved when the site is accessed. Used to record a user’s unique behaviour during each visit.

The ability to show multiple ads in a single location, varying the treatment displayed on each new page load and/or within a single page load. Ads are generally rotated to either avoid consumer wear-out or as a part of ad optimisation and testing. 

Language used by many internet applications for exchanging information.

This website provides consumers with information about how behavioural advertising works, further information about cookies and the steps they can take to protect their privacy on the internet. It is written by and supported by the internet advertising industry as part of an initiative to enhance transparency and control for online behavioural adve [..]

Mark-up language developed specifically for wireless applications to enable optimum usage of the limited display capabilities of a handset. 

The language used to create most mobile internet sites.

Third party lightweight web application that can be embedded in a 3G mobile phone.

A type of website that allows visitors themselves to easily add, remove, and otherwise edit and change some available content.