A List of Commonly Used Terms
Below is a list of commonly used terms and definitions.
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Ad
Also called Web advertising. An ad is almost always a banner or button, a graphic image of a designated pixel size and byte size limit. Often animated. An ad or set of ads for a campaign is often referred to as “the creative,” Banners and other special advertising that include interactive, audio or visual image elements beyond the usual are known as rich media.
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Banner
A horizontal ad on a page linked to an advertiser’s site. A banner or button is an ad in the form of a graphic image. Ads are usually GIF or JPEG images. Animated banners seems to attract more clicks than static images, although – perhaps surprisingly – text-only ads frequently have much higher click-through rates than banners and buttons.
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Cache, caching
Web pages and graphics (including ads) are sometimes saved on a computer or server’s hard drive so the next time the page is viewed they do not have to be retrieved off of the Internet. A cached ad will be viewed by the user, but not counted by the ad tracking programs. This sometimes causes visitors to see old versions of a page or ad.
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Hits
A hit is the receipt of a single request to a Web server (page, graphic, audio or other file type). When you call up a Web page, the page, as unique Web element, is a unique server request. When you add graphics or other elements to the page, those are also unique server requests. So, a single page with two simple graphics on it constitutes three unique server requests, or three hits. The number of hits is only an indication of how busy your server is. Hits are not an appropriate measure to use for analyzing traffic, users or comparing sites.
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Inventory
The total number of ad views or impressions that a Web site has to sell during a given period of time. The number of ads on a page, multiplied by the number of pages served (delivered) determines the total inventory. Inventory can be broke down further by specific category. (“We’re totally out of inventory in the sports section and the photo gallery, but still have some in our wedding section.”)
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Java
A high-level programming language, originally designed under the name OAK for set-top boxes and hand-held devices. It is now widely used for building applications on the Internet because it provides a simplified object-oriented language for advanced features, increased animation detail and real-time updates.
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Results
These are usually the final, specific outputs desired from a site. Results are often expressed as products or services for an internal or external customers, but not always. They may be in terms of financial accomplishments, impact on a community, etc. Results are expressed in terms of cost, quality, quantity or time.
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Rich media
Advertising with animation, sound and interactive elements more elaborate than GIFs or JPEGs. Rich-media ads are often built in Flash or Java. Rich media ads are often used for ads with pop-up menus that may let the visitor select a particular page to link to on the advertiser’s Web site. Rich-media ads have become increasingly popular.
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Unique visitor / unique user
A unique visitor is someone with a unique IP address who is entering a Web site for the first time in some specified time period. Thus, someone that returns within that time frame is not counted twice. Unique visitor counts tell you how many different people there are in your audience during the time period, but not how much they used the site during the period.
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User session
Someone with a unique address who enters or re-enters a Web site during a specified period. A user session is sometimes determined by counting only those users that haven’t re-entered the site within the past 20 minutes or a similar period. User sessions are a better indicator of total site activity than “unique visitors” since they indicate frequency of use.
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Vertical banner
A vertical banner is an Internet ad that is typically taller than it is wide – e.g., 120 pixels wide by 240 pixels high. For more information on specific sizes of Web ad units, see:
http://iab.net/standards/adunits.asp .



