Judicial Branch

The primary function of the judiciary is to adjudicate legal disputes. The judiciary is also responsible for interpreting the law, but while in some legal systems this is a fundamental principle (e.g. Common Law jurisdictions), in others the primary responsibility for interpreting the law belongs not to the judiciary but to the legislature - traditionally, Civil Law and Socialist Law jurisdictions - although even in them, the judiciary inevitably must play some interpretive role, since interpretation of the law is an inseparable part of adjudicating legal disputes. - http://www.wikipedia.org/wiki/Judicial_branch

topped by the Supreme Court (in the USA)

also

• Court Of Appeals

• District Court/FederalDistrict Court