What Is a Demand-Side Platform (DSP)? A Guide for Marketers

What is a demand-side platform?

A demand-side platform (DSP) is software that lets advertisers buy ad impressions from many publishers through one interface. "Demand" means the buyers: brands, agencies and the teams that run their media. The DSP is their side of the programmatic trade.

Picture a brand that wants to reach young professionals across 200 news sites, 50 apps and a few streaming services. Without a DSP, that is 250 separate conversations, rate cards and reports. With a DSP, it builds one campaign with one audience and one budget, and the platform buys matching impressions wherever they appear.

DV360 (Display & Video 360) is Google's DSP. It sits inside Google Marketing Platform alongside tools such as Campaign Manager 360. If you are new to how this kind of buying works overall, our guide to what programmatic advertising is gives the bigger picture.

What does a DSP actually do?

A DSP does six jobs for the buyer.

1. Connects to supply. It plugs into ad exchanges and supply-side platforms, so you can bid on inventory from thousands of sites, apps, streaming services and screens.
2. Runs deals. Private marketplace, preferred deal and Programmatic Guaranteed deals with named publishers arrive in the DSP, where you accept them and attach them to line items.
3. Targets. Audience lists, contextual categories, location, language, device, day and time, plus exclusions for brand safety.
4. Bids. For every bid request that matches a campaign, it decides whether to bid and how much, using fixed bids or automated strategies tied to your goal.
5. Controls frequency and pacing. One frequency cap across every publisher, and budget pacing across the flight.
6. Measures. Impressions, viewability, clicks, video completions, reach and conversions, in reports you can cut by publisher, audience, creative or deal.

The bidding happens at huge scale, on bid requests that arrive and expire within milliseconds. If you want to see how a single auction plays out, read our explainer on real-time bidding.

How is a DSP different from an SSP, an ad exchange or an ad network?

These terms get mixed up all the time. The simplest way to tell them apart is to ask who uses each one.

The lines blur in practice. Google, for example, runs a DSP for buyers (DV360) and a separate platform for publishers (Google Ad Manager). For a buyer, the point to remember is that the DSP is where the decisions are made.

Is Google Ads a DSP?

Not in the usual sense. Google Ads is a self-serve platform built mainly around Google's own inventory: Search, YouTube, Discover, Gmail and the Google Display Network of partner sites and apps. It is easy to start, has no minimum spend and works on the bids and budgets you set.

A DSP such as DV360 goes further. It buys from many third-party exchanges as well as Google's, runs private and guaranteed deals with named publishers such as OTT apps and news sites, gives you finer control over inventory and frequency across channels, and covers third-party streaming apps and digital out-of-home screens. It also takes more skill to run well. Our DV360 vs Google Ads comparison sets out which suits which kind of campaign.

Meta's Ads Manager works on the same principle as Google Ads for Facebook, Instagram and Meta's own partner network. These platforms are strong inside their own properties, but they are not built to buy the wider open web, OTT and DOOH in one place.

Which DSPs do Indian advertisers use?

DV360, The Trade Desk and Amazon's DSP are the three names most planners compare.

Some larger advertisers use more than one, for example DV360 for YouTube, OTT deals and broad reach, with a second DSP for a specific need such as retail signals. Our comparison of programmatic advertising platforms goes deeper, and we have head-to-heads on DV360 vs The Trade Desk and DV360 vs Amazon DSP.

How do DSPs charge?

Your total cost usually has four parts.

• Media cost: what you pay publishers for impressions, set by auction or by deal.
• Platform fee: what the DSP charges for its technology, often a percentage of media spend. Rates are set by contract and are rarely published.
• Data and verification fees: third-party audience segments, brand safety and viewability tools, usually charged per thousand impressions.
• Service fee: if a partner or agency runs the account, they charge for the work, as a percentage of spend, a fixed monthly fee or a campaign fee.

An illustrative example, with made-up fee levels, shows the arithmetic. On a ₹10 lakh monthly budget, suppose ₹1.5 lakh goes on platform and service fees and ₹20,000 on verification. That leaves ₹8.3 lakh for media. At ₹120 CPM, that buys about 69 lakh impressions, not the 83 lakh you would get if the whole budget bought media.

So compare quotes on the full cost and on cost per result, not on headline CPM. Ask for media cost and every fee to be shown separately, in writing.

How do you get access to a DSP in India?

There are four routes, and the right one depends on your team as much as your budget.

1. Your own seat. A direct contract with the DSP, usually with spend commitments. This suits the largest agencies and advertisers.
2. A self-serve seat under a partner. Your team logs in and runs campaigns, while the partner handles the platform contract, billing in rupees and support. See our DV360 self-serve account for how this works.
3. Co-managed. Your team and a specialist partner both work in the same account, with the partner handling harder tasks such as deals and optimisation.
4. Managed service. A partner plans, buys, optimises and reports for you, and you approve the plans.

Our guide on how to get a DV360 account in India walks through the documents and steps.

What should you look for when choosing a DSP?

Work through these questions before you sign anything.

• Does it reach the inventory you need? For Indian brands this often means YouTube, OTT apps, Hindi and regional-language publishers, and possibly DOOH.
• What data can you use? Your own first-party lists, the platform's audiences and contextual options.
• How does it measure? Conversion tracking, viewability, reach and frequency, and brand lift.
• Who runs it day to day? A DSP is only as good as the person using it. Ask who will log in and how often.
• What does it really cost? Media, platform, data, verification and service fees, all written down.
• Can you pay in rupees with GST invoices? Paying in foreign currency adds friction for many Indian companies.
• What are the minimums? Both for the platform and for any premium deals you want.

What mistakes do teams make with a new DSP?

1. Getting a self-serve seat without a trained trader, then running everything on default settings.
2. Comparing DSPs on CPM alone, instead of cost per viewable impression or cost per result.
3. Switching on every exchange with no inclusion or exclusion lists.
4. Launching without conversion tracking, which leaves automated bidding nothing to learn from.
5. Splitting a small budget across two DSPs, so neither gets enough data to optimise.

Next step

If you are weighing up DSP access, our DV360 services page sets out each setup, from self-serve to fully managed, and what each one includes. If you are unsure which fits your team, talk to our team and we will suggest a setup based on your budget and skills.