The document discusses OpenStack, an open source cloud computing platform. It provides an overview of OpenStack's history, core projects, and services. The core projects allow users to provision compute, storage, and networking resources. OpenStack uses a modular architecture and is designed to easily scale out workloads across multiple virtual machines. Major contributors include companies like Red Hat, HP, IBM, and Rackspace who aim to develop OpenStack as an open infrastructure for both private and public clouds.