A trial court or court of first instance is a court having original jurisdiction, in which trials take place. Appeals from the decisions of trial courts are usually made by higher courts with the power of appellate review (appellate courts). Most appellate courts do not have the authority to hear testimony or take evidence, but instead rule solely on matters of law.

In the trial court, evidence and testimony are admitted under the rules of evidence established by applicable procedural law and determinations called findings of fact are made based on the evidence. The court, presided over by one or more judges, makes findings of law based upon the applicable law. In most common law jurisdictions, the trial court often sits with a jury and one judge; in such jury trials, the jury acting as trier of fact. In some cases, the judge or judges act as triers of both fact and law, by either statute, custom, or agreement of the parties; this is referred to as a bench trial. In the case of most judges hearing cases through the bench trial process, they would prefer that all parties are given an opportunity to offer a vigorous and robust case presentation, such that errors in testimony, procedures, statutes, etc., do not grow "crab legs" (compounded errors) and are remanded or returned to their court on appeal.