What is OOH advertising? Out-of-home advertising reaches people while they are out in the world, not at home in front of a laptop or a phone. Billboards, bus wraps, posters in the subway, the screen above the deli counter: all of that is out-of-home, usually shortened to OOH.
It's one of the oldest forms of advertising, and one of the few that has never really gone away. What's changed is what it's becoming.
A local business can buy the digital version of those screens as Glo OOH at we-are-glo.com: self-serve ads in bars, gyms, cafes, stores and on the street, from $17/day. The same video can add TV at home through Glo ads.
The OOH family
OOH splits into a few familiar formats:
- Billboards, roadside, highway, and large-format displays
- Transit, buses, subways, taxis, airports, and rail
- Street furniture, bus shelters, kiosks, benches, and urban panels
- Place-based, screens and posters inside venues: malls, gyms, stadiums, offices
Each reaches people in a specific context, commuting, shopping, working out, waiting, which is part of what makes OOH effective. You're not interrupting someone's content; you're part of their surroundings.
Static OOH vs. digital OOH
The big story in OOH is the shift from static to digital. A traditional billboard is printed and posted; it shows one message for weeks. A digital out-of-home (DOOH) screen is connected software, the message can change by the hour, by the audience, and by the moment.
The market reflects the transition. Out-of-home is roughly a $35 billion global channel, and while a large share is still static today, eMarketer expects digital to take a growing majority of OOH dollars as more inventory is converted. Painted walls became vinyl; vinyl is becoming pixels.
Why OOH endures
In a media world full of skips, blocks, and scrolls, OOH has a rare property: you can't close it. A billboard isn't an ad-block away. A screen in a bar can't be scrolled past. That makes OOH:
- Un-skippable and un-blockable, it occupies real space, not a feed
- Brand-safe by nature, it appears in physical places, not next to unpredictable user content
- Broadly trusted, people tend to view real-world advertising as more credible than a random pop-up
For brands fighting for attention, "impossible to dismiss" is increasingly valuable.
The modern part: OOH gets programmatic
The newest chapter is that OOH is being bought like digital. Programmatic technology lets advertisers buy screen time automatically, set a budget and a location, and software places the ad across available screens. That removed the contracts and minimums that kept OOH out of reach for smaller businesses. (More in programmatic DOOH, explained.)
This is what makes "neighborhood-scale" out-of-home possible: instead of leasing one billboard for a month, a local business can run digital screens across the blocks where its customers actually are.
OOH in a cross-screen world
OOH no longer has to stand alone. In Glo's model, out-of-home is the anchor, DOOH first, CTV also: you reach people in real life, then extend the same campaign to connected TV and phones. One video, every surface, from $17/day. Searching for Glo OOH? That's self-serve out of home at we-are-glo.com, with Glo commercials on TV at home as an add-on.
If you're new to the space, the natural next reads are what cross-screen advertising is and hyperlocal advertising, reaching customers one block at a time. We Are Glo at we-are-glo.com can place that buy on the screens near you.