The Certified Kubernetes Application Developer (CKAD) is an exam. It certifies that you can properly use Kubernetes to design, build and deploy cloud-native applications. This proctored test is performance-based and is composed of problems that you’ll solve in the command line. You can learn more about CKAD in the book Certified Kubernetes Application Developer (CKAD) Study Guide published by O'Reilly in today's post where we look at this and other Kubernetes books.