[GTM glossary](/glossary.txt) Demand-side platform

Marketing

# Demand-side platform (DSP)

In short

A demand-side platform (DSP) is software that lets advertisers and agencies buy ad impressions across many websites, apps, and other inventory sources from a single interface. It handles audience targeting, bidding, budget pacing, and reporting.

A DSP is the buyer side of programmatic advertising. It connects to ad exchanges and supply-side platforms, evaluates each available impression, and bids automatically if the impression fits the campaign rules. Its counterpart on the seller side is the supply-side platform.

## What a DSP does

* **Audience targeting:** Uses first-party lists, account lists, contextual categories, or location to choose who sees an ad.
* **Bidding:** Sets a price for each impression, either automatically or by rules.
* **Budget and frequency control:** Paces spend and caps how often one person sees the ad.
* **Reporting:** Shows impressions, clicks, conversions, and cost.

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## How a DSP works in a transaction

When a page loads, the publisher sends the available slot to an exchange. The DSP receives the request with data about the slot and the user, checks it against active campaigns, and returns a bid. The highest bid wins and the ad is shown, all within a fraction of a second. This process is called real-time bidding.

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## How B2B teams use a DSP

B2B teams use DSPs for account-based advertising: upload a target account list, match it to devices or IP ranges, and show ads only to people at those companies. Say a team uploads 500 target accounts and runs a short sequence of ads timed with outbound outreach. Sales can then see which accounts engaged.

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## What to check before choosing a DSP

* **Audience matching:** How well it matches your account or contact lists to real impressions.
* **Inventory access:** Which exchanges and formats it can reach.
* **Transparency:** Fees, reporting detail, and where ads ran.
* **Integration:** Whether it connects to your CRM and measurement tools.

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## Common mistakes

* **Broad targeting:** Wide audiences waste budget in B2B.
* **No frequency cap:** Overexposure annoys prospects.
* **Judging by clicks alone:** Measure account engagement and pipeline instead.

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## Demand-side platform FAQs

**What is a demand-side platform (DSP)?**

A demand-side platform is software advertisers use to buy digital ad impressions from many sites and apps through one interface. It manages targeting, bidding, budget pacing, and reporting for programmatic campaigns.

**What is the difference between a DSP and an SSP?**

A DSP serves advertisers who buy impressions. A supply-side platform serves publishers who sell impressions. They connect through ad exchanges, so the DSP bids and the SSP offers inventory to the highest bidder.

**How does a DSP work?**

When a page loads, the publisher offers the ad slot through an exchange. The DSP receives the request, compares it with campaign targeting, and submits a bid in milliseconds. The highest bid wins and its ad is displayed.

**How do B2B marketers use a DSP?**

They upload target account or contact lists, match them to impressions, and show ads only to people at those companies. This supports account-based advertising and lets teams see which accounts engaged with their campaigns.

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## More related phrases

* [Demand](/glossary/demand.txt)
* [Demand creation](/glossary/demand-creation.txt)
* [Demand generation](/glossary/demand-generation.txt)

## Similar phrases

* [Programmatic advertising](/glossary/programmatic-advertising.txt)  
Programmatic advertising is the automated buying and selling of digital ad space in real time, using software and data to target specific audiences.
* [Account-based advertising](/glossary/account-based-advertising.txt)  
Account-based advertising shows ads only to people at a chosen list of target companies, so ad spend goes to accounts you actually want to win.
* [Supply-side platform (SSP)](/glossary/supply-side-platform.txt)  
A supply-side platform (SSP) is software publishers use to sell ad inventory automatically to many buyers, aiming to maximize revenue from each impression.
* [Real-time bidding (RTB)](/glossary/real-time-bidding.txt)  
Real-time bidding (RTB) is an automated auction in which advertisers bid for each ad impression in milliseconds, as a page or app loads for a user.
* [Decision stage](/glossary/decision-stage.txt)  
The decision stage is the point in the buyer journey where a prospect has a shortlist and is choosing a vendor, weighing price, risk, fit, and internal approval.