Clear, practical definitions of media planning terms — from CPM to connected TV, programmatic to reach curves. Written for practitioners, not textbooks.
Conversion Rate (CVR) is the percentage of users who complete a desired action — a purchase, lead form submission, app install, or sign-up — after being exposed to or clicking on an ad. It is one of the most direct indicators of campaign effectiveness and the health of the post-click experience. CVR bridges top-of-funnel media investment with bottom-funnel business outcomes.
CPA stands for Cost Per Acquisition (also called Cost Per Action) and measures the total advertising cost required to generate one conversion — a purchase, sign-up, download, or any defined business outcome. It is the primary efficiency metric for performance-based advertising campaigns.
CPC stands for Cost Per Click and measures the amount an advertiser pays each time a user clicks on an ad. It is the dominant pricing model in paid search advertising and a core performance metric across social, display, and shopping channels.
CPCV stands for Cost Per Completed View and measures the advertising cost for each instance where a viewer watches a video ad in its entirety — from the first frame to the last. Unlike CPV, which counts any sufficiently long view, CPCV requires 100% completion of the ad unit.
CPL stands for Cost Per Lead and measures the total advertising spend required to generate one qualified prospect — typically a user who has submitted contact information, requested a demo, signed up for a trial, or otherwise indicated active interest. CPL is the primary efficiency metric for B2B advertising and lead-generation-focused B2C campaigns.
CPM stands for Cost Per Mille (Latin for 'thousand') and measures the cost an advertiser pays for 1,000 ad impressions. It is the most widely used pricing model in display, video, and programmatic advertising.
CPV stands for Cost Per View and measures the amount an advertiser pays each time a user views a video ad. On YouTube, a 'view' is counted when a user watches at least 30 seconds of a skippable in-stream ad (or the full duration if shorter than 30 seconds) or interacts with the ad by clicking.
Click-Through Rate (CTR) is the percentage of ad impressions that result in a user clicking the ad. It is calculated by dividing total clicks by total impressions and multiplying by 100, and is used as a primary engagement signal across paid search, display, social, and email advertising.
Dayparting is the practice of scheduling advertising to run only during specific hours of the day or days of the week when target audiences are most likely to engage or convert. Borrowed from broadcast television, where the day is divided into named blocks (morning, daytime, primetime, late fringe), dayparting now applies across programmatic, paid search, social, and streaming channels.
A Demand-Side Platform (DSP) is software that allows advertisers and agencies to purchase digital ad inventory across multiple ad exchanges and supply sources through a single, unified interface using real-time bidding (RTB). DSPs automate the buying process, apply audience targeting, and optimize bids in milliseconds — replacing the manual insertion order process that previously dominated media buying.
eCPM, or Effective Cost Per Mille, is a normalized metric that expresses the actual revenue (or cost) per 1,000 impressions across campaigns running on mixed pricing models — CPM, CPC, CPA, or flat-rate. It converts any pricing structure into a common unit, enabling apples-to-apples comparison across placements, channels, and line items. For publishers, eCPM is the primary measure of inventory monetization efficiency; for advertisers, it reflects the blended cost of reaching 1,000 people across a mixed-model media plan.
Effective reach is the percentage of a target audience that receives a minimum number of ad exposures — defined by a set effective frequency threshold — within a specified campaign period. Unlike gross reach (which counts any exposure), effective reach counts only those audience members who have seen the ad often enough to register awareness, comprehension, or intent to act.
Flighting is a media scheduling strategy in which advertising runs in concentrated bursts (called 'flights') separated by planned periods of inactivity called hiatuses. Unlike continuous scheduling, flighting concentrates impressions and budget into windows where audience receptivity or seasonal demand peaks.
Frequency is the average number of times a unique individual or household is exposed to an ad or campaign within a defined time period. It represents the 'depth' counterpart to reach's 'breadth': where reach tells you how many different people saw your ad, frequency tells you how many times each person saw it. Together, reach and frequency define the full shape of a campaign's audience delivery, and their product — reach multiplied by frequency — equals total gross impressions (or GRPs when reach is expressed as a percentage of the target population).
An impression is counted each time an ad is rendered or displayed to a user, regardless of whether the user engages with it. Total impressions represent the gross number of ad exposures across all placements and audience members during a campaign — including duplicate exposures to the same individual.
Incrementality measures the true causal lift that advertising creates — the conversions, revenue, or brand actions that would not have occurred without a campaign. Rather than asking which channel received credit for a conversion, incrementality testing asks a more fundamental question: would this conversion have happened anyway, even without the ad? It answers this by comparing outcomes in an exposed test group against a matched, unexposed control group under controlled experimental conditions.
Media mix is the strategic combination and allocation of advertising channels — such as linear TV, CTV, paid search, programmatic display, social media, audio, and out-of-home — used in a campaign or annual plan to reach target audiences across touchpoints. The media mix determines how total budget is distributed across channels in pursuit of reach, frequency, and business outcome objectives.
Media Mix Modeling (MMM) is a statistical analysis technique that measures the contribution of each marketing channel — paid media, promotions, pricing, seasonality, and macroeconomic factors — to a business outcome such as sales, revenue, or conversions. Unlike user-level attribution, MMM operates on aggregated time-series data, making it privacy-safe and capable of modeling both digital and offline channels. It produces channel-level return-on-investment estimates and enables budget allocation simulations across the full marketing mix.
Pacing is the rate at which a campaign's budget is spent and impressions are delivered over a defined flight period. A correctly paced campaign spends its budget proportionally across available days and hours, ensuring impressions are distributed evenly (or strategically) and that the campaign neither exhausts its budget prematurely nor ends the flight period with significant unspent dollars.
A Private Marketplace (PMP) is an invitation-only programmatic auction in which a publisher or curated network of publishers offers premium ad inventory exclusively to a selected set of buyers, transacted via a unique Deal ID passed between the publisher's SSP and the buyer's DSP. PMPs retain real-time bidding dynamics — buyers still bid competitively — but within a controlled, premium-access environment with publisher-defined floor prices and inventory restrictions.
Programmatic advertising is the automated buying and selling of digital ad inventory using software, data, and real-time auction technology — replacing manual insertion orders and human negotiation with algorithmic decisioning. It encompasses a range of transaction types, from open real-time bidding (RTB) on ad exchanges to private marketplace deals and fully reserved programmatic guaranteed arrangements.
Reach is the number — or percentage — of unique individuals or households exposed to an ad campaign at least once within a defined time period. Unlike impressions, which count every ad serving event including repeat exposures to the same person, reach counts each unique person only once, regardless of how many times they saw the ad. It is the foundational audience coverage metric in media planning and is used alongside frequency to describe both the breadth and depth of a campaign's audience impact.
Return on Ad Spend (ROAS) measures the revenue generated for every dollar spent on advertising. It is expressed as a ratio or multiplier — a 4:1 ROAS means $4 in revenue was attributable to every $1 in ad spend — and is the primary financial efficiency metric for direct-response and performance media campaigns.
Share of Voice (SOV) is the percentage of total advertising presence or spend within a defined category that belongs to a single brand. It quantifies how loud a brand is relative to all competitors in a market and is a foundational input for media budget-setting and competitive strategy.
A Supply-Side Platform (SSP) is technology used by publishers and app developers to manage, sell, and optimize their digital ad inventory programmatically across multiple demand sources — including ad exchanges, DSPs, and ad networks — simultaneously. SSPs run real-time auctions that allow publishers to maximize yield on every available impression by exposing it to the widest possible pool of competing buyers.
vCPM, or Viewable Cost Per Mille, is a pricing model in which advertisers pay only for impressions that meet a defined viewability threshold — typically the Media Rating Council (MRC) standard of at least 50% of the ad's pixels visible on screen for a minimum of one continuous second (display) or two continuous seconds (video). Unlike standard CPM, which charges for every ad served regardless of whether it appeared in a visible portion of the page, vCPM ties spend directly to the probability that a user actually saw the ad.
Viewability is a digital advertising measurement standard that determines whether an ad impression had a genuine opportunity to be seen by a human user. An impression is counted as served when it is delivered to a browser or device, but a viewable impression requires that a meaningful portion of the ad actually appeared in the user's visible screen area for a minimum duration. Viewability was developed to help advertisers distinguish valuable, in-view inventory from wasted spend on ads that load below the fold, in background tabs, or on pages immediately abandoned.
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