Which of the following describes OOH advertising?

Outdoor advertising, often referred to as OOH (Out of Home) advertising, specifically encompasses advertising placements in public places. This method targets consumers while they are outside their homes, engaging them through billboards, transit ads, and various other formats found in urban environments and along roadways. The primary goal of OOH advertising is to reach people where they live, work, and travel, capitalizing on high visibility and the potential for extensive audience exposure.

The other options focus on digital or more targeted advertising methods, which do not fall under the definition of OOH. For instance, advertising on online platforms pertains to digital marketing that takes place in the virtual environment. Similarly, advertising through mobile apps and advertising in email campaigns are both digital strategies designed to reach consumers through their devices and inboxes, respectively. Each of these methods utilizes different tactics and channels distinct from the broad, physical reach of OOH advertising.