What is Employee performance appraisal

Let me google that for you (http://lmgtfy.com/?q=define+Employee+performance+appraisal)

The process by which a staff members employment is rated.

I'm suspecting that there is more to this question since the answer to what you posted should have been obvious. As Ben said its how an employee's performance is rated.

So is there more to what you really want to know?

I agree, is there a problem or issue with a review ?