Behind every Team site is a SharePoint site and this provides the secure storage area for your files and folders.  But not every SharePoint site created has a Team site - how do you tell at a glance if your SharePoint site has a Team site?  Just look for the little Teams icon in the SharePoint site name.  And if it's there- great!  Teams is a great 'one-stop shop' for all your communication and collaboration needs and a much more user-friendly place to work from than SharePoint - we think!