The document discusses community clouds as a shared cloud infrastructure service. It notes that cloud computing enables on-demand access to configurable computing resources. A community cloud is a cloud infrastructure shared by a specific community for advantages like cost savings, flexibility, and standardization to prevent lock-in. The document outlines different cloud models and focuses on the infrastructure as a service model. It describes options like a federated or brokered community cloud model and notes challenges around licensing, security, and standardization.