How quickly Google serves your ads. Or, another way of looking at it, how quickly you spend your daily allocated budget. AdWords offers two choices for Ad Delivery — Accelerated and Standard. Your campaign is set to Standard Delivery by default.

Ad Delivery (Accelerated): A form of Ad Delivery that serves your ads as quickly as possible. This method rapidly spends your daily allocated budget.

Ad Delivery (Standard): The default form of Ad Delivery that spaces out the serving of yours ads throughout the course of the day to balance your daily budget. We recommend this option if you want to create an even distribution of your ads throughout the day.