PPC Automation is a way to automate control of your PPC campaigns using code. Two very well known examples of this are Google Ads Scripts and the Adwords API. It allows you to create reports, update bidding, provide tools for analysis, as well as sending you alerts on the status of your campaign, along with many other features, and all on automatic pilot.
As a result, automation is taking the center-stage of what is done by the top PPC specialists, with some experts labeling this (along with AI) as the future of marketing. All you have to do is to determine how each step of a complicated strategy can be executed then automate it afterwards.