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Ad unit

A named placement definition: size, format and where it lives.

Ad unit and placement are often used interchangeably. Where a distinction is made, the ad unit is the definition and the placement is a specific instance of it on a page or screen.

Ad unit300x250displaya definitionPlacementarticle_topsidebar_1instances on a page
The ad unit is the definition; the placement is a specific instance of it on a screen.
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