What does 'Private Marketplace' mean?

A Private Marketplace (PMP) is a specialized type of online marketplace that connects advertisers with a curated group of publishers. It provides a secure and controlled environment for buying and selling digital advertising inventory. This feature is gaining popularity as it offers several benefits over the traditional open marketplace. One of the major advantages of a PMP is the control it gives to both advertisers and publishers. Advertisers have the ability to choose which publishers they want to work with, and publishers can select which advertisers they want