The elevation prompt requires user interaction to confirm that an authorized transaction is taking place. When an account has administrative access, the account user has agreed to use this type of pre-screening to prevent unauthorized changes to the system that require elevation. For example, as an administrator, you will still run many applications without elevated privileges under UAC. Actions that require elevation will require you to run that program using "Run as Administrator".
Running as a standard user also requires this confirmation, and an administrator password for an additional layer of security.
Here is further information about it, particularly "Over-the-Shoulder" and "Admin Approval Mode" should be of interest to you in...