Archive for the ‘Glossary’ Category

File Under: Glossary


A bitmap is a mapped array of pixels that can be saved as a file.

Both JPEG and GIF are bitmap graphic formats. Currently, the only other way to store an image is as a vector graphic. You can’t easily scale bitmap images, but you can control every single pixel and thus achieve many effects impossible in vector graphics. Conversely, vector formats offer advantages of scalability and lower bandwidth requirements. When you compress a bitmapped image, you suck out some of the visual information.

To bypass this, the portable network graphics format (or PNG, pronounced “ping”) was designed to store a single bitmap image for transmittal over computer networks without losing this data.

File Under: Glossary


CPM, or cost per thousand impressions, is the marketing world’s metric for judging the merits of different media buys.

Offline, CPM is calculated by taking the total cost of a given ad buy, dividing it by the total estimated viewership of a given advertisement, and multiplying the total by 1000. Here’s an example: You buy a magazine ad for US $5,000. The magazine’s subscriber base is 50,000. Therefore, the CPM will be ($5,000/50,000) x 1,000, or $100.

On the Web, CPM is a little different. Since it’s so difficult to accurately determine the total number of visitors to a website, the CPM is calculated using the number of actual ads served. The distinction is subtle, but critically important: in the offline world, marketers simply guess how many times an ad is seen, whereas on the Web, we know.

File Under: Glossary

Embedded Media

These are the types of media you can include in an HTML page, such as audio files, flash or GIF animations.

File Under: Glossary


Short for “inline frame,” Iframes are used to insert a block of text into a separate HTML document. Iframes can float above page elements using absolute positioning, or they can be placed directly on the page with page elements flowing around them. Unlike regular frames, Iframes can not be resized by the user. (NOTE:Iframes are not supported by older browsers.)

File Under: Glossary


A loop is like a programming thought. Say you’re a police officer using a radar gun to catch speeding motorists. If the speed limit is 55 miles per hour, you might say to yourself: “If a car makes my radar gun display a higher value than 55, I’ll pull them over, but until then I will continue to take readings. And perhaps snack on this cruller.” In programming, the statement of this loop would be the action (firing up your motorcycle and chasing the speeder), and the expression would be the evaluation of whether or not the passing car made your radar gun read higher than 55. This is an example of a “while” loop:

  while (carSpeed < 55) {

  carSpeed = readRadar();

  // note:readRadar() should return the latest carSpeed


pullEmOver();  // this will only execute once carSpeed is >= 55