This document compares and contrasts collaboration tools in Office 365 including Yammer, Groups, and Teams. It provides information on how each tool functions, such as Yammer being an enterprise social network for messaging with hashtags and mentions, Groups being a container that provisions identities and permissions across Office 365 apps, and Teams being a channel-based collaboration tool powered by Skype for chat, calls, and meetings. The document aims to help understand the different options for collaboration in Office 365.