---
title: What is an SSP in DOOH advertising?
description: "Supply-side platform: software that sellers use to make their ad space available to buyers automatically. Learn what SSP means in DOOH advertising."
type: glossary
term: SSP
shortDefinition: "Supply-side platform: software that sellers use to make their ad space available to buyers automatically."
category: buying
alsoCalled:
  - Supply-side platform
seeAlso:
  - DSP
  - Programmatic
  - Inventory
---

An SSP works for the seller. It is how a media owner's inventory is offered to programmatic buyers.