Teams vs SharePoint Sites

laceyk 

If you create a "team" in Microsoft teams, a SharePoint site and M365 group will be created with it. If you create a SharePoint team site with M365 group, a team in Microsoft teams will be created automatically.

Check these documentation to understand this in detail:

1. Microsoft Teams, SharePoint, and Microsoft 365 Groups integration (IT Admins) 
2. SharePoint and Microsoft 365 Groups integration (IT Admins) 
3. Microsoft 365 Groups and Microsoft Teams 

If you need reporting based on Microsoft teams, you can use PowerShell tools like PnP PowerShell, Microsoft Teams PowerShell or CLI for Microsoft 365. You can find few script sample related to this topic at:

1. List all Microsoft Teams team's Owners and Members 
2. Fetch Teams Information Using Teams PowerShell And Export To CSV 
3. List all teams and teams members in Microsoft Teams in the tenant 

Please click Mark as Best Response & Like if my post helped you to solve your issue. This will help others to find the correct solution easily. It also closes the item. If the post was useful in other ways, please consider giving it Like.