This document provides an introduction to Office 365 Groups. It discusses why collaboration is evolving to involve more teams. Office 365 Groups are described as a collection of people that provides an integrated experience and brings together various solutions. Key principles of Office 365 Groups are that they are self-service, public by default, allow sharing to non-members, and provide context and history with a single definition that is simple to manage. The document demonstrates how different communication tools, like Exchange, SharePoint, Planner, and Yammer integrate with Office 365 Groups. It also covers security, creation, and governance of Office 365 Groups and provides resources for learning more.