What is the difference between the ADODB and ADOR objects?

The ADODB Library contains additional server side objects (Connection, Command, Error, Parameters, and so forth). These are best used within server side components to communicate with the database. The ADOR Library is a lighter weight client that allows the manipulation of an existing recordset on the client. It does not include the Connection, Command, Error, or Parameters commands. The ADOR functionality is distributed with the ADO client components.