Employees are graded into different buckets at the end of performance assessment from "Needs Improvement" to "Exceptional". These terminology can vary depending on the method being used. The Intent of these ratings is to use for computation of Salary Revisions, Bonus, Promotion etc.,   

PS: Synergita implementation for your Organization may vary from how the features are described here. The screen shots given here may also be different from what you see in your system. Please talk to the concerned person in the Organization for any specific queries.