How does the judicial branch interact with the other branches?

The government of the United States is divided into three branches in order to ensure that authority is divided equally and that no one branch is able to gain too much power (also known as checks and balances). Each branch has its own distinct role to make sure that our government runs as smoothly as possible. Making laws is the duty of the legislative branch, which is headed by Congress. The President leads the executive branch and is responsible for putting the laws into action. Laws are evaluated and applied to individual cases by the Supreme Court, which is the head of the judicial branch.
Because the judicial branch has the power to decide whether or not the laws created by the legislative branch and carried out by the executive branch violate the Constitution, they are able to monitor the power of these two branches. Justices of the Supreme Court interpret the laws and evaluate them to make sure they are in accordance with the Constitution. 
The other branches are also able to check the power of the judicial branch. Justices are nominated by the President and then reviewed by the Senate. In order for a judge to be appointed to the Supreme Court, they are subject to approval by both of the other branches of government, though Congress makes the final decision.