Office 365 ProPlus is a version of Office that's available through Office 365. It includes the applications that you're familiar with, including Access, Excel, OneNote, Outlook, PowerPoint, Publisher, Skype for Business, and Word, that you can install on your desktop, laptop, or mobile device.
You can use these applications to connect with Office 365 services such as SharePoint Online, Exchange Online, and Skype for Business Online.