Legal profession is a profession, and legal professionals study, develop and apply law. Usually, there is a requirement for someone choosing a career in law to first obtain a law degree or some other form of legal education. It is difficult to generalize about the structure of the profession, because there are two major legal systems, and even within them, there are different arrangements in jurisdictions, and terminology varies greatly. While in civil law countries there are usually distinct clearly defined career paths in law, such as judge, in common law jurisdictions there tends to be one legal profession, and it is not uncommon, for instance, that a requirement for a judge is several years of practising law privately.