A Microsoft 365 group gets created automatically when you do the following in these products: Planner: Create a new plan SharePoint: Create a new site collection Outlook: Create a new group Power BI: Create a new workspace Teams: Create a new team Etc. A team in Teams, a SharePoint team site, and a group in Outlook are all provisioned in Microsoft 365 Groups. It’s important to understand that you’ll have group-backed SharePoint sites and non-group-backed SharePoint sites. A group-backed SharePoint site will have different capabilities and management options than a SharePoint site that isn’t group-backed, depending on the backend resource.Modern SharePoint team sites are powered by Microsoft 365 Groups