What is CTV advertising? A plain-English guide for enterprise marketers

Have you noticed the term "CTV" gets thrown around like everyone inherently agrees on what it means? Truth is, they probably don't. Some marketers use it interchangeably with streaming, some think it’s the same thing as OTT—and some just hope they don’t have to define it out loud. Let's fix that.

In the blog, we explore CTV advertising basics and all its components in plain English, so everyone can get on the same page about what Connected TV really is and how it really works—and why it’s so important for enterprise marketers to nail down.

CTV advertising in one paragraph

Connected TV (CTV) advertising is video advertising delivered to viewers watching streaming content on internet-connected television devices (think smart TVs, Roku, Fire TV, Apple TV, gaming consoles, etc.). It's different from linear TV, which delivers ads on a fixed broadcast or cable schedule regardless of who's actually watching. And it's different from OTT advertising on phones and laptops, because CTV specifically means the ad is landing on the biggest screen in the house—the television. Same internet-delivered video, different destination.

CTV vs. OTT vs. linear TV vs. streaming TV: Sorting the alphabet soup

These four terms get used almost interchangeably in conversation, and that's exactly the problem. They're related, but they're not the same thing, and the distinctions matter when you're trying to plan or buy media.

• Linear TV: Traditional scheduled broadcast or cable. The ad runs at 8:42pm whether you're watching or not.
• OTT (over-the-top): Any video delivered over the internet, on any device. This is the broadest category—CTV is a subset of OTT.
• CTV (connected TV): OTT content viewed specifically on a TV screen, via a smart TV or a connected device like Roku or Fire TV. The defining factor is the screen, not the platform.
• Streaming TV: A colloquial term that usually means the same thing as CTV, but you'll sometimes see it used interchangeably with OTT. Context matters more than precision here.

The easiest way to keep these straight: All CTV is OTT, but not all OTT is CTV. If your ad is showing up on a TV screen through an internet connection, you're in CTV territory. If it's showing up on someone's phone during their commute, that's OTT, but it's not CTV.

Here’s a quick explainer you can reference:

Hold up: Is YouTube considered CTV? Only when it's watched on a connected TV through the TV's YouTube app. The same content watched on a phone is OTT, not CTV. Again—it's the device that decides, not the platform.

How a CTV ad actually gets to a viewer

CTV looks like a simple linear process from the outside, but there's a real supply chain underneath it. Here’s how a CTV ad actually reaches your screen:

1. Inventory supply: Streaming services and FAST (free ad-supported streaming TV) channels make ad inventory available. Think Hulu, Peacock and Max on the ad-supported-tier (AVOD) side, and Tubi, Pluto and Roku Channel on the FAST side.

2. Buying: Advertisers buy that inventory either directly from the streamer (a negotiated deal, like the ones brands have used for decades) or programmatically through a demand-side platform (DSP) like Epsilon Digital, targeting specific audiences in real time.

3. Targeting & identity resolution: This is the step that makes CTV fundamentally different from linear. The audience gets matched to a household or device using some combination of streaming-service login data, device IDs, IP-based household graphs and the advertiser's own first-party data—often run through a clean room or identity provider to keep it privacy-safe.

4. Delivery & measurement. The ad gets served into the stream, and exposure is measured at the household or device level, then reconciled back to outcomes—a site visit, a store visit, a purchase—through that same identity resolution layer.

It’s important to call out step 3 (targeting and identity resolution) because it's the one linear TV never had to deal with and the one that determines whether everything downstream (frequency capping, measurement, attribution) actually works.

Where CTV inventory lives (the publisher landscape)

You don't need to memorize every streaming app to plan a CTV campaign, but it helps to know the three buckets inventory typically falls into:

• Premium streamers with ad tiers: Netflix, Disney+, Max, Peacock, Hulu, Paramount+, Amazon Prime Video, etc.
• FAST channels: Tubi, Pluto TV, Roku Channel, Samsung TV Plus, Freevee, etc.
• OEM and operator inventory: Smart TV home screens (Samsung, LG, Vizio) and device platforms like Roku and Amazon Fire TV.

Here's the catch: Access varies a lot by partner. Some streamers sell exclusively direct, some open programmatic access and some restrict what targeting you're allowed to layer on top of their inventory. This is the fragmentation problem—and it's a big part of why CTV planning feels harder than linear ever did, even though the ads themselves look almost identical to the viewer.

What CTV does that linear TV can't

There are five real advantages, and they're the reason CTV ad spend keeps climbing even as the buying process gets more complicated:

• Audience targeting beyond demographics: Linear TV buys against broad age/gender demos. CTV lets you layer in first-party data, third-party segments and behavioral signals at the household or device level—a meaningfully different level of precision.
• Cross-screen frequency control: But there’s a caveat: This only works as well as your identity layer does (more on that in the next section).
• Closed-loop measurement: Exposure can be connected to digital and offline outcomes through identity resolution.
• Speed and flexibility: Campaigns can launch, pause and optimize within hours instead of waiting on upfront commitments negotiated months in advance.
• Reach into cord-cutter and cord-never households: These are audiences linear simply doesn't touch at scale anymore. Streaming captured roughly 47% of total TV viewing time in early 2026, regularly outpacing broadcast and cable combined—a share that's only grown as more households shift their primary viewing to connected devices.

The hard parts (where most CTV plans run into trouble)

While it would be great if your CTV planning and buying was seamless, these are the four problems you'll most likely run into:

1. Fragmentation. No single platform reaches the whole CTV audience. Advertisers have to assemble coverage across multiple supply paths—direct deals, programmatic, FAST channels—to get to scale.
2. Identity. Frequency capping and measurement are only as good as the identity spine tying exposures together across streamers and devices. Without unified identity, the same household can see the same ad 30-plus times across different platforms, with absolutely no way to know it's happening.
3. Measurement. Every streamer reports independently, in its own format, on its own timeline. Reconciling impressions and outcomes into a single source of truth typically requires a clean room, a measurement partner or both.
4. Pricing and transparency. CPMs vary widely. Some inventory sells direct at a premium, while others move programmatically with real ad-tech fees baked into the supply path that aren't always obvious from the buy side.

So, what’s the solve? The differentiator that smooths over these four problems is the identity foundation and measurement layer sitting underneath the technology—not necessarily the technology itself. We dug into exactly this tension in The CTV paradox: more streaming choices, less customer connection, if you want the fuller argument for why more streaming options haven't translated into better customer connection for most advertisers.

What "good" looks like in a first CTV campaign—5 steps to success

If you're running your first or second CTV campaign, here's a practical five-step starting point:

1. Define the outcome metric upfront: Visits, sales, lift—not just CPM and reach. CTV gets measured differently than linear and deciding what "working" means before you launch saves a lot of debate.
2. Decide the audience strategy. First-party seed list, third-party segment, household-level demo, or geo-based—pick the approach that matches what you're actually trying to learn or sell.
3. Choose the supply path. Direct with one or two streamers, or programmatic across many.
4. Set up identity and measurement before launch. Frequency caps, household-level tracking, and your attribution model all need to be configured before the campaign goes live. Not retrofitted afterward.
5. Plan in-flight optimization. Decide in advance what gets adjusted, on what cadence and against what metric. CTV moves fast enough that "wait and see" usually means wasted spend.

If you're already past this stage and evaluating how to structure an ongoing CTV strategy, Your CTV playbook is the natural next read.

Where to go next

CTV advertising isn't complicated in concept—it's video ads on a connected TV screen. What's complicated is everything underneath: the fragmented supply, the identity problem, the measurement reconciliation. Understanding those mechanics is what separates a CTV plan that performs from one that just looks good in the deck.

If you’re interested in continuing to explore the Connected TV topic, we have a few pieces to go deeper:

1. Read The CTV paradox for our take on why more streaming choice has made customer connection harder, not easier.
2. Read the CTV buyer's guide for a framework on evaluating CTV partners.
3. Explore Epsilon Digital's CTV advertising offering.

FAQ

What is the difference between CTV and OTT?

OTT is the broader category—any video delivered over the internet, on any device. CTV is the subset of OTT delivered specifically to a TV screen via a smart TV or connected device. All CTV is OTT, but not all OTT is CTV.

Is YouTube considered CTV?

YouTube viewed on a connected TV, via the TV's YouTube app, counts as CTV. YouTube viewed on a phone or laptop is OTT but not CTV. The distinction is the device, not the platform.

How much does CTV advertising cost?

CPMs typically range from the high $20s to $50+, depending on supply path, audience targeting and inventory premium. Direct deals with major streamers tend to price higher than programmatic buys.

How is CTV advertising bought?

Two paths. Direct: buying inventory straight from a streaming publisher, like a negotiated Hulu deal. Programmatic: buying across multiple supply sources via a DSP like Epsilon Digital, The Trade Desk or Amazon DSP. Most enterprise advertisers use both.

Can you measure CTV ads the way you measure digital?

Yes, but it's harder. CTV measurement requires identity resolution (matching the exposed household or device to a known customer or prospect) and most streamers report independently. Closed-loop measurement is achievable, but it typically requires a clean room or a dedicated measurement partner.

Is CTV replacing linear TV?

Streaming has overtaken linear in share of total TV time—Nielsen's The Gauge has shown streaming consistently capturing around 47% of TV viewing through early 2026, ahead of broadcast and cable individually. Linear still holds scale for live sports and news, but the long-term direction is clear.