On the Office 365 administration portal, there are several roles that you can assign to users in your organization. These roles are based on the most common scenarios for Office 365 daily administration tasks.

The summary of the permissions that each role has are as follows:

There are also additional roles specific to services that you might use, such as Exchange and SharePoint.

You can read about these roles here at https://support.office.com/en-us/article/About-Office-365-admin-roles-da585eea-f576-4f55-a1e0-87090b6aaa9d.