Final answer:
The Confrontation Clause ensures the right to confront and cross-examine witnesses presented by the prosecution. Face-to-face confrontation may not be required or approved in cases involving witness intimidation.
Step-by-step explanation:
The purpose of the Confrontation Clause, which is part of the Sixth Amendment, is to ensure that those accused of crimes have the right to confront and cross-examine witnesses presented by the prosecution. This guarantees the accused the opportunity to challenge the credibility and accuracy of the witnesses' testimony. However, there are circumstances when face-to-face confrontation may not be required or approved, such as when witness intimidation is a concern.