The new Office app for Windows 10 provides a way for users to quickly get started with Office, find what they need, and jump into their work.
The Office app will replace the My Office app, which currently helps users manage their Office 365 subscriptions. If you already have the My Office app, you will get the new Office app through an automatic update in the coming months. Otherwise, you can download it from the Microsoft Store. Starting this summer, new Windows 10 devices will come with the Office app already installed—
Source: Introducing the Office app for Windows 10 – Microsoft 365 Blog