Pre-integrated systems are vendor-provided solutions that combine compute, network, storage, and management functions as a single engineered solution. This approach is also known as a converged infrastructure or a hyper-converged infrastructure. The vendor provides pre-configured, pre-tested hardware and software components that work together seamlessly. The pre-integrated system reduces the complexity of building and deploying IT infrastructure, while also improving performance, scalability, and reliability. This approach is different from a DIY (do-it-yourself) approach, where an organization builds its infrastructure from individual components, and a DCaaS (Data Center as a Service) approach, where the organization outsources its entire data center to a third-party provider. Reference: Section 1.7 Converged Infrastructure, page 62.