A court trial is the formal hearing at which a criminal charge or civil claim is determined by a judge, and where applicable a jury, on the basis of evidence and legal argument. It involves the calling and cross‑examination of witnesses, presentation of documents and other evidence, and submissions on fact and law, leading to a judgment or verdict.“Trial” is a descriptive procedural term used across criminal and civil courts rather than a concept with a single statutory definition. In England & Wales and Northern Ireland, the term is used in both civil and criminal procedure rules; in Ireland it is likewise central to court practice; in Scotland the equivalent criminal process is a “trial diet” and in civil proceedings a “proof” or “proof before answer”, though “trial” is still widely understood.Key issues at a court trial include the applicable standard and burden of proof, admissibility of evidence, case management directions, and compliance with rules of procedure. For litigators, the trial is the culmination of pleadings, disclosure, and interim applications, and determines liability, conviction or acquittal, and the basis for any appeal.