What is the main job of the judical branch?

The primary responsibility of the Judicial Branch is to interpret and apply the laws, and ensure their constitutionality. The judicial branch includes federal courts including the Supreme Court.

The Judicial Branch of the United States government comprises the federal courts established under Article III of the Constitution, sometimes called the "constitutional" courts. These courts hear cases related to most Federal Laws, US treaties and the US Constitution.

The only federal courts in the Judicial Branchare:

• US District Courts
• US Court of Federal Trade
• US Court of Appeals Circuit Courts
• Supreme Court of the United States

The US government has other federal courts that hear special types of cases, such as US Bankruptcy Court, US Tax Court, and the US Court of Federal Claims, etc., but these are part of the Legislative Branch, not part of the Judicial Branch. This is important to know, because many people believe all federal courts are part of the Judicial Branch, but they're not.