Glossary

Ad tech, in plain English

52 terms we use with publishers, app teams and advertisers every day. Filter by topic or search for a term.

Programmatic

Ad exchange

The marketplace that runs the auction between sellers and buyers in real time.

CTV

Ad pod

A sequence of ads played together in one break, the way a TV commercial break works. Pods are filled by the ad server and can mix buyers.

Basics

Ad server

The system that decides which ad to show for a given request and records what happened. Publishers run one to manage direct and programmatic demand together.

Transparency

ads.txt

A public file on a publisher's site listing the companies authorised to sell its inventory. Buyers check it to avoid counterfeit supply.

Transparency

app-ads.txt

The app version of ads.txt, hosted on the developer's website and linked from the app store listing.

In-app

ARPDAU

Average revenue per daily active user. A common way for app and game teams to compare monetization across days and cohorts.

Formats

Banner

A small, usually sticky display unit at the edge of the screen. It earns quietly in the background rather than interrupting.

Programmatic

Bid request

The message an exchange sends to buyers describing an available impression, so they can decide whether to bid.

Formats

Bottom wing

A 320×50 unit anchored below a video player that runs while the content keeps playing, so no video time is given up to it.

Advertisers

Brand safety

Controls that keep ads out of content a brand considers unsuitable. Starting with curated supply is more reliable than blocking keywords.

Measurement

Click-through rate CTR

The share of impressions that result in a click. Useful for direct response, weak as a measure of brand attention.

Measurement

Completion rate

The share of video ads played to the end. Read it together with whether the view was chosen by the user.

Advertisers

Contextual targeting

Choosing where an ad runs based on the content of the page or video rather than on data about the person.

Basics

CPM

Cost per thousand impressions, the standard way video and display inventory is priced.

Transparency

Creative filtering

Rules that block specific creatives, categories or advertisers from appearing, protecting the audience and the publisher's brand.

CTV

CTV

Connected TV: television watched through an internet-connected device or app, bought programmatically or directly. Learn more

Basics

Curated marketplace

A marketplace where publishers and apps are vetted before their inventory is offered, rather than an open pool of unknown supply.

Programmatic

Deal ID

An identifier that connects a buyer to agreed inventory and terms, used for private marketplace and programmatic guaranteed deals.

Basics

DSP

Demand-side platform: the system a buyer uses to bid on inventory across many exchanges from one place.

In-app

eCPM

Effective cost per thousand impressions: total revenue divided by impressions, the usual way to compare formats and partners.

Basics

Fill rate

The share of ad requests that return an ad. A low fill rate points at demand, floors or format problems.

Formats

Floating player

A video player that follows the reader down the page, docking into a corner so the content keeps playing while they scroll.

Advertisers

Frequency capping

Limiting how often one person sees the same ad. Harder across apps and devices than within a single site.

Formats

Full page

A full-screen display takeover shown between pieces of content, with a clear way to close it.

Formats

Half page

A display unit that shares the screen with the content, so the story keeps playing above the ad.

Programmatic

Header bidding

Running an auction among several demand sources before calling the ad server, so more buyers get a fair chance to compete.

Formats

In-stream

A video ad that plays inside editorial video content, before it, during it or after it.

Measurement

Interaction rate

How often people tap, expand or otherwise engage with an ad unit, rather than just see it.

Formats

Interstitial

A full-screen ad shown at a natural break, such as between game levels or articles, rather than mid-action.

Transparency

Invalid traffic IVT

Impressions that come from bots, fraud or misrepresented inventory. Layered pre-bid and post-bid checks reduce it.

Formats

Linear display

A display creative, commonly 336×280, shown at the top of a vertical player with the advertiser's name, URL and button below it.

Formats

Linear vertical display

A display creative that fills the whole player, giving display inventory the share of voice a video ad would get.

Formats

Native ad

A sponsored unit that follows the look of the surrounding feed and is always clearly labelled. Learn more

Programmatic

OpenRTB

The industry protocol for real-time bidding. It defines how bid requests and responses are structured between buyers and sellers.

Formats

Outstream

A video player that opens inside an article as the reader scrolls and plays muted until they engage.

Programmatic

Prebid Server

Server-side header bidding: the auction runs on a server rather than in the browser or app, which reduces device load.

Advertisers

Private marketplace PMP

An invitation-only deal that gives a buyer access to selected inventory at agreed terms, usually through a deal ID.

Advertisers

Programmatic guaranteed PG

Reserved inventory bought programmatically: fixed volume and price, executed through the pipes of real-time bidding.

In-app

Rewarded video

An opt-in video ad where the user gets something they value in return, such as extra lives, coins or unlocked content. Learn more

Transparency

Sellers.json

A public file where an intermediary lists the sellers it represents, so buyers can trace the supply path.

Measurement

Share of voice SOV

How much of the screen and moment an ad owns. A full-screen vertical video ad has all of it; a banner shares it with the content.

Formats

Skip control

The option to skip an ad after a set number of seconds. It shifts the job of the first seconds from exposure to persuasion.

Basics

SSP

Supply-side platform: the technology a publisher uses to offer inventory to many buyers and manage the auction.

Advertisers

Supply path optimisation SPO

Buyers choosing the shortest, most transparent route to inventory, cutting out intermediaries that add cost without value.

Programmatic

VAST

The standard XML response that tells a player where the video ad file is and which tracking events to fire.

Video

Vertical video

Video shot or framed for a phone held upright, usually 9:16, played full screen in a swipeable feed. Learn more

Measurement

Viewability

Whether an ad had a real chance to be seen, measured by how much of it was on screen and for how long.

Vortex

Vortex OpenSDK

The open side of the Vortex SDK: one integration that connects any ad network or SSP through Prebid Server, OpenRTB, VAST or native formats. Learn more

Vortex

Vortex SDK

The native iOS and Android SDK that brings editorial video experiences and monetization into an app. Learn more

Basics

Waterfall

An older way of filling inventory by calling demand partners one after another instead of in one auction.

Formats

Wing

See bottom wing: a display unit that runs beside or below the player, adding revenue without taking video time.

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Questions Behind the Terms?

We are happy to walk through how any of this works on your site, app or campaign.