The app launcher/switcher

This is also known as the Waffle menu, and contains the applications that are available to you through the Office 365 platform as per your Office 365 license. Your license may be different than that of your peers, so you may have more or fewer applications than them. The Waffle, which travels from application to application, allows you to get around Office 365 with ease. The following is a representation of what you may see in your Waffle, depending on the applications you have access to and your role in your organization:

As you can see, you get a truncated list of apps with an option to see your full list. After this list is a list of recently used documents.