A judge is the head of a legal court, presiding over the proceedings and ultimately passing judgment in the case or dictating the terms of a sentence. Depending on the type of legal system a nation has, there are several different ways of becoming a judge. In nations such as the United States, which have common law legal systems, a judge is an attorney who may have undergone additional training. In a nation with civil law, such as France, judges are specially trained legal professionals who sit on inquisitorial panels or oversee local courts, depending on how the law is laid out.

Being a judge requires an extensive knowledge of the law, and the ability to be completely impartial in a case. A judge should consider the letter of the law, rather than personal feelings, when considering a case, and must be prepared to work long hours for less pay than attorneys conventionally receive. In cases where the judge cannot be impartial, the judge should apply to be dismissed from the trial, to ensure that justice is carried out.

In a common law system, someone who wants to become a judge should start by becoming a lawyer. While becoming a lawyer, the candidate may want to think about what kind of judge he or she wants to be. There are local trial judges who oversee basic criminal trials, state judges, and federal judges. Each step in the judicial ladder requires more knowledge of the law. In addition, there are appeals judges, judges who specialize in appeals cases. As a trial judge, someone may see a wide variety of cases, while other judges specialize in family law, bankruptcy, or small claims.

After successfully qualifying as an attorney, many prospective judges practice law for some time before taking the next step. There are two options: someone can run for public office as a judge, or apply for a judgeship. Vacancies in some local courts are filled with elected judges, who must run a campaign just like any other politician. Other vacancies are filled through competitive application, which can get fierce, and a judge should be prepared to apply several times before being successful. Once appointed, a judge will take an orientation course, and should plan on taking periodic workshops and classes to retain the position.

In a civil law system, where judges decide the outcome of cases without juries, a judge undergoes separate legal training. In many cases, a potential judge may choose to qualify as a lawyer and take the coursework required for judges, but this is not required. After qualification, the judge can apply for court positions.