There are two basic types of cases, criminal and civil (including family cases).
A criminal case results when a person is accused of committing a crime. You, as a juror, must decide whether the person charged is guilty, or not guilty. The accused person is presumed innocent, and the State, represented by the District or County Attorney, must prove guilty "beyond a reasonable doubt."
A civil case results from a disagreement or dispute between two or more parties. In a civil case, you, as a juror, must answer questions of disputed facts based upon the testimony and evidence admitted by the judge. The answers to these questions are called the verdict.