Page about ad
Showing an ad is called an impression and it is what a publisher sells in order to generate a revenue.
I have seen one advertisement actually sell not twice as much, not three times as much, but 19½ times as much as another. Both advertisements occupied the same space. Both were run in the same publication. Both had photographic illustrations. Both had carefully written copy. The difference was that one used the right appeal and the other used the wrong appeal.
The location of an ads is called a slot
Ad Space or Advertising space is much known as inventory
You can use the Google Publisher Tag (GPT) to build responsive ads that fit the browser your visitors use to view your website. Google Responsive Ad
The Content type of an ad.
Example:
See Ad - Targeting
An ad server is the application used to manage, run, and report on the ads life-cycle and performance.
Example of a react component: Ad.js
An ad is typically set in a aside element