In digital advertising, under banner refers to inventory or placements positioned below the initial viewport, typically encountered after a user scrolls or expands a container. This guide explains how under banner placements function within campaign structures, how performance is measured, and how to decide when and how to use them. Rather than chasing maximum visibility, treating under banner as part of a balanced media mix supports cost efficiency and long-term planning. The following sections define key concepts, compare formats, and outline durable practices for integrating under banner into broader performance and brand strategies.
