Office 365 is so chock-full of apps, it’s sometimes difficult to keep track of them all. Sure, you have the most popular tools like Word and Skype for Business, but there are three tools in the lineup that seem like they could be used the same way: Outlook Groups, Yammer, and Microsoft Teams.

Yammer, Outlook Groups, and Microsoft Teams have plenty in common. They’re all Office 365 tools designed for sharing files and communicating with colleagues. So what differentiates each from the other and when should you use them? Here’s a quick rundown to help you decide.