In a jury trial, \”challenge” refers to the right of each party to request that a juror be excused. There may be a “challenge for cause” on the basis the juror had admitted prejudice or shows some obvious conflict of interest (e.g. the juror used to work for the defendant or was once charged with the same type of crime) which the judge must resolve. If the juror is excused (removed) “for cause,” then the challenge does not count against the limited number of challenges allowed each side. More common is the “peremptory challenge,” which is a request that a juror be excused without stating a reason.