What is Bench Trial?

Legal Definition
A bench trial is a trial by judge, as opposed to a trial by jury. The term applies most appropriately to any administrative hearing in relation to a summary offense to distinguish the type of trial. Many legal systems (Roman, Islamic) use bench trials for most or all cases or for certain types of cases.

While a jury renders a verdict, a judge in a bench trial does the same by making a finding.
-- Wikipedia
Legal Definition
A type of trial in which there is no jury. The judge must determine both questions of law and questions of fact. See, e.g., Lewis v. United States, 518 US 322 (1996).

See Jury trial (contrast).
Legal Definition
the trial where the judge will find the facts and also apply the law instead of letting a jury decide the law.