CTV vs OTT Advertising: What DV360 Buyers Need to Know

CTV vs OTT Advertising: Clearing Up the Confusion

Ask five media buyers to define CTV and OTT and you'll likely get five different answers. The two terms are used interchangeably across sales decks, planning tools and even ad platforms — but they describe different things. Getting the distinction right matters, because it changes how you plan, target, price and measure your streaming video.

This guide breaks down what CTV and OTT actually mean, where they overlap, and how to buy both effectively inside Display & Video 360 (DV360).

Definitions: Device vs Delivery

The simplest way to keep these straight is to remember that OTT describes how content is delivered, while CTV describes the device it's watched on.

What is OTT?

OTT (over-the-top) refers to any video or TV content delivered over the internet, "over the top" of traditional cable, satellite or broadcast infrastructure. If content reaches a viewer through an internet connection rather than a cable box or aerial, it's OTT.

OTT is delivery-agnostic when it comes to hardware. You can watch OTT content on:

• A smart TV or streaming stick
• A laptop or desktop browser
• A smartphone or tablet
• A gaming console

What is CTV?

CTV (connected TV) refers specifically to a television set connected to the internet, used to stream content. That includes:

• Smart TVs with built-in apps (Samsung, LG, Vizio and others)
• Streaming devices plugged into a TV (Roku, Amazon Fire TV, Apple TV, Chromecast)
• Gaming consoles used to stream video on a TV

In other words, all CTV is OTT, but not all OTT is CTV. A person streaming a show on their phone is watching OTT content, but not on a CTV device. The same show on a Roku-connected living-room TV is both OTT and CTV.

The Key Differences That Affect Your Media Plan

The device-vs-delivery distinction has real consequences for planning and performance.

Factor	CTV	Broader OTT (mobile/desktop)
Primary screen	Living-room TV	Phone, tablet, laptop
Viewing context	Lean-back, often co-viewed	Lean-forward, often solo
Ad experience	Full-screen, non-skippable formats common	Skippable and shorter formats common
Completion rates	Typically high	More variable
Clickability	Limited (no direct click on most TVs)	Direct response possible
Best-fit objective	Awareness, reach, brand building	Reach plus consideration and action

Why co-viewing matters

CTV is frequently watched by more than one person at a time. That has upsides — greater effective reach per impression — and complications for measurement, since one impression may represent several viewers. Standard frequency and reach models don't always account for co-viewing, so treat household-level metrics with nuance.

Why the screen changes the creative

A 6-second bumper that works on a phone can feel abrupt on a 65-inch TV. CTV rewards story-driven, TV-quality creative with clear audio and legible on-screen text. OTT on smaller screens tolerates faster, punchier formats and, importantly, can support clickable or interactive elements that a living-room TV usually can't.

How CTV and OTT Work in DV360

DV360 gives you access to premium streaming inventory across both CTV devices and other OTT environments, which is one of the platform's biggest strengths for video buyers. A few things to understand before you build a campaign.

Inventory sources

In DV360 you can reach streaming inventory through:

• YouTube and YouTube TV, including CTV-delivered YouTube views
• Programmatic Guaranteed and Private Marketplace deals with broadcasters, streaming apps and publishers
• The open marketplace for select CTV and OTT supply

Deals (PG and PMP) are the backbone of serious CTV buying. Premium TV publishers tend to make their best inventory available through direct or private deals rather than the open auction, which gives you tighter control over context, quality and pricing.

Targeting realities

Audience targeting on CTV is more constrained than on desktop or mobile, largely because TVs don't carry the same identifiers as browsers and phones. In practice, plan for:

• Strong contextual, genre and app-level targeting
• Household and geographic targeting
• First-party data activation where match rates allow
• More limited cookie-based retargeting than you'd use in display

This is why a clean first-party data strategy pays off. If you're building audiences for streaming, our team can help you connect the right data sources — see our DV360 managed services for how that's operationalised.

Frequency management

One of the most common problems in streaming is over-exposure — the same viewer seeing your ad far too often across apps. DV360's frequency controls help, but fragmentation across publishers and devices makes household-level frequency hard to cap perfectly. Use deal-level and campaign-level frequency management deliberately, and monitor it as a first-order metric, not an afterthought.

Planning: When to Lean CTV vs Broader OTT

Both belong in most video plans. The question is emphasis.

Lean into CTV when you want to:

• Build brand awareness and mental availability at scale
• Reach cord-cutters and light TV viewers you can't hit with linear
• Deliver premium, full-screen, sound-on brand storytelling
• Complement or partially replace linear TV budgets

Lean into broader OTT (mobile/desktop) when you want to:

• Extend reach efficiently beyond the living room
• Drive consideration or action with clickable formats
• Retarget engaged users with more precision
• Sequence messaging after a CTV impression

The strongest strategy usually blends the two: use CTV to establish the brand story on the big screen, then use OTT and other channels to reinforce and convert. Building that cross-device narrative is exactly where DV360 outperforms single-channel tools.

Measuring CTV and OTT

Measurement is where streaming gets genuinely difficult, and where honest expectations matter.

• Completion and viewability are the core delivery metrics for CTV. High completion rates are expected given non-skippable formats.
• Reach and frequency should be evaluated at the household level, with awareness of co-viewing.
• Attribution is harder because CTV rarely produces a click. Lean on incrementality studies, brand lift, and cross-device conversion modelling rather than last-click logic.
• Verification for fraud and brand safety is essential — CTV has been a target for invalid traffic, so buy through trusted deals and apply third-party verification where possible.

If you're standardising streaming measurement across brands or markets, our measurement and analytics work focuses on building attribution frameworks that reflect how video actually influences outcomes.

Common Mistakes to Avoid

• Treating CTV and OTT as identical line items. Different screens, contexts and creative needs deserve different treatment.
• Expecting click-based performance from the living-room TV. Judge CTV on reach, completion and brand impact.
• Ignoring frequency until it's a problem. Cap and monitor from day one.
• Buying only on the open exchange. Premium supply and better transparency live in deals.
• Reusing mobile creative on the big screen without review. Check audio, pacing and legibility.

Getting Started the Right Way

Whether you run DV360 in-house or through a partner, the fundamentals are the same: understand what you're buying, structure deals for quality supply, respect the differences between the big screen and everything else, and measure against realistic objectives.

If you're setting up streaming buys for the first time, a self-serve DV360 account gives you the platform access to test and learn, while co-managed services pair your team with specialists to accelerate the ramp.

Talk to a DV360 Video Specialist

CTV and OTT reward buyers who understand the nuances — and DV360 gives you the controls to act on them. If you want help planning, structuring deals or measuring streaming video that actually moves the needle, get in touch with our team. We'll help you build a video strategy that treats CTV and OTT for what they really are.