Important Microsoft no longer recommends creating and using Access web apps in SharePoint. As an alternative, consider using Microsoft PowerApps to build no-code business solutions for the web and mobile devices.
In Access web apps, summary views act like on-screen reports, letting you group and summarize data by different values. Watch this video to see how they’re made.
This video doesn't apply to Access desktop databases. For information concerning creating grouped or summary reports in desktop databases, see create a grouped or summary report.