The document provides an overview of Mesosphere Datacenter Operating System (DCOS). It discusses that DCOS treats an entire datacenter as a single computer by abstracting complexities. It runs applications and services across shared resources in an elastic and scalable way. Major components of DCOS include Mesos, Docker Swarm, and Kubernetes for container management. The document argues that DCOS and Mesosphere represent the future of datacenter management by enabling easy administration of distributed systems similar to smartphone apps.