While every organization is at a different stage in its cloud migration journey, cloud security has proven to be a perennial challenge. Though business leaders largely understand that a cloud migration strategy must account for strong security practices, the next question is: What does "cloud security"mean? While there is no silver bullet, cloud security is crystallizing as a combination of strong built-in security and advanced capabilities. Nowhere is this requirement more pressing than in the foundational practice of firewalling. This IDC Technology Spotlight reviews the trends and possibilities in cloud security as well as key partnerships that enable a path to consistent and comprehensive cloud security.