Google Ad Manager is an ad exchange platform introduced by Google on June 27, 2018. It combines the features of two former services from Google's DoubleClick subsidiary, DoubleClick for Publishers (DFP; formerly known as DART for Publishers) and DoubleClick Ad Exchange (AdX). Google Ad Manager initially used a second-price auction format, before announcing that it would be replaced with a first-price auction format in March 2019.