G Suite (formerly Google Apps for Work and Google Apps for Your Domain) is a brand of cloud computing, productivity and collaboration tools, software and products developed by Google.
G Suite comprises Gmail, Hangouts, Calendar, and Google+ for communication; Drive for storage; Docs, Sheets, Slides, Forms and Sites for collaboration; and, depending on the plan, an Admin panel and Vault for managing users and the services.
Office 365 is the brand name Microsoft uses for a group of software and services subscriptions, which together provide productivity software and related services to subscribers.
For consumers, the service allows the use of Microsoft Office apps on Windows and macOS, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month.
For business users, Office 365 offers service plans providing email and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, and integration with Yammer, as well as access to the Microsoft Office software.