This document discusses the transformation of data centers to cloud computing. It begins by defining data centers and traditional data center architecture. Next, it defines cloud computing based on definitions from Gartner and NIST, including the ability to rapidly provision resources over the internet. It then shows examples of cloud computing services from infrastructure to platforms to software. Finally, it discusses how businesses can transform their approach to using either a self-built cloud, buying cloud services, or using a hybrid approach to take advantage of the cloud computing model.