It’s no secret that header bidding has had a significant impact on the online advertising industry. This advanced programmatic technique enabled publishers to reduce latency, increase ad yield and reduce passbacks. However, header bidding was far from perfect when it first came out in 2009. It had various problems in its early days, such as non-existent industry standards, lack of collaboration among suppliers, and incomplete solutions. All of that changed when Prebid.js came out in 2015.