SharePoint App Registrations are incredibly useful for unattended tasks to read or update SharePoint sites. It's similar to a user service account but more secure. They cannot be used as a user sign-in. They are used in custom applications or automated scripted processes. They are made even more secure with a certificate, in which case, they may only run from the machine that owns the certificate. SharePoint Things to Do with App Registrations Read data and write the data to another process Write CSV, text, or XML files Useful for data for to import into report software Writing the data to other APIs such as ERPs, Project software, or work authorization systems Changing the data Check the data based on a schedule. Update the data based on constraints Change permissions of items in a SharePoint list once an item is past due Work with partners and vendors to provide just-in-time, specific access to necessary data Simple Process Create the application either in SharePoint or in App Re