What is one of the key functions of a grand jury?

A grand jury primarily serves the important function of hearing testimony and examining evidence to determine whether there is sufficient cause to bring criminal charges against an individual. This process is distinct from a trial, which involves a determination of guilt or innocence, and does not involve sentencing or issuing final verdicts. Instead, the grand jury focuses on the evidence presented to assess whether it supports moving forward with charges, thus playing a crucial role in the judicial process by acting as a preliminary check against unwarranted prosecutions. This function helps ensure that individuals are not subject to criminal charges without a reasonable basis, serving as a safeguard for civil liberties.