The Judicial Branch of our government consists of U.S. Supreme Court and lower federal courts. The U.S. Supreme Court is the highest court in the land and currently has 9 judges.
Justices are chosen by the President and are confirmed by the Senate, Like each and every federal judge. Their terms do not expire meaning they hold their position for life.
The U.S. Supreme court hears cases that challenge the constitution, interprets legislation, and is supposed to protect civil rights, deal with disputes between states, and preside over cases that involve treaties.
One of the most important powers of the Supreme court is Judicial Review. Judicial Review allows for the court to proclaim that legislation or an Executive Act is unconstitutional.
This has been very lacking within the past several decades though due to the politicization of the court. Therefore, the decisions made by the Supreme Court have had a very significant impact on society in a very bad way due to a lack of accountability within the courts.