We as security professionals have become used to the idea that security is a state to reach, but it is unattainable. In part, because the old security architecture no longer meets the enterprise needs, and because we have not adopted a more intelligent architecture that is focused on enterprise data and risk. There are several challenges that the enterprise security teams must navigate. This chapter introduced concepts that will be further explored in this book and that will address these challenges and provide a methodical approach to securing the enterprise with the adoption of a new, flexible, and agile security architecture.