There are two opposed judicial systems, based on Roman - civil law (Europe, most of Asia, S. America, good part of Africa) and common law (English law).
Basic difference is that in Roman law derived systems, case law is not a source of law. You cannot base decisions on other verdicts.
Also, we do not have jury here, but in some case, we have a few judges, some of them being laymen, independently overseeing the work of the judge in session (and in fact, sitting behind/above him). It is a form or citizens' control of the judicial branch. In higher instances there is also a possibility of several judges being in charge of one case.