Microsoft Office 365 (often called Microsoft 365 or Office 365) is a Web-based version of Microsoft's Office suite of enterprise-grade productivity applications, including email, MS Office, SharePoint, One drive, etc. Each office user will be granted with an E3 license which store user will be given an F1 account.
F1 license
https://products.office.com/en-us/business/office-365-f1
E3 license
https://products.office.com/en/business/office-365-enterprise-e3-business-software