The document discusses the architecture of infrastructure in cloud computing. It covers why organizations move to the cloud, cloud-ready architectures like grid and transactional, common cloud services like object storage, compute instances, load balancers and CDNs. It also discusses disaster recovery, capacity planning, dynamic, proactive and reactive scaling in the cloud. The document provides examples of Amazon and other cloud vendor services and considerations for when an organization may not be suitable to move completely to the cloud.