Display ads are ads that appear in the online space. The first display ads were ‘banner ads’, hyperlinked, image-based ads shaped as a strip, and usually located at the top of a web page. Later, as web design became more complex and creative, display ads evolved to a range of shapes and sizes, and included videos, interactive elements, pop-up functions and more. Today, banner ads simply refer to a specific size, of 468 x 60 pixels.
Source: Outbrain