A jury is a group of 12 people who have been chosen at random to sit in a Court trial, to hear the evidence and reach a verdict (decision).
The jury’s job is to decide what facts have been proved, apply the law to the facts with guidance on the law from the Judge, and return a proper verdict.
It is vital, (if you are chosen to sit on the jury) to be impartial & keep an open mind to the evidence that is heard.