The role of a defense counsel is to protect the legal rights of the defendant, ensure a fair trial, and advocate for the best possible outcome for their client. In a criminal trial, a defense counsel is responsible for representing the defendant against the charges brought by the prosecution. This may involve investigating the case, negotiating with the prosecution, presenting evidence and arguments in court, and cross-examining witnesses.In a civil trial, a defense counsel represents the defendant in a lawsuit brought by a plaintiff. The defense counsel's role is to challenge the plaintiff's claims and present evidence and arguments to support the defendant's position.