Definition of Rebuttal
The rebuttal is a response to give evidence to refute an argument made by opposing counsel. Rebuttal witnesses are provided by both the prosecution and the defense with the goal of refuting arguments made by each party. Prior to the start of the case witness testimony and evidence is submitted to the court which allows both the prosecution and the defense to prepare their rebuttals.
For example, if the prosecution plans to call a medical expert to testify, the defense team may call another medical expert to refute their testimony. Rebuttal testimony is limited to testimony which has already been introduced. There are many ways to refute testimony with a rebuttal such as invalidating the information by questioning the credentials of the witness or by providing an alternative argument about the events in question.