There are three branches of government. No branch is higher or more important than the others. They are all equally important.
When the writers of the Constitution wrote our plan of government, they were very concerned about the government having too much power. Yet they understood the importance of having a federal government with some power based on the issues faced by the weak government established by the Articles of Confederation.
To keep the branches of government from being too power, the system of checks and balances and the system of separation of powers were created. Under the concept of separation of powers, each branch of a government has a specific job to do. The legislative branch makes the laws, the executive branch carries out the laws, and the judicial branch interprets the laws. No branch of government can do it all by itself. Under the system of checks and balances, each branch can control the other branches. The President can veto laws of Congress while Congress can override the veto. The courts can declare laws as unconstitutional while Congress can impeach judges and the President. Thus, no branch is higher or more important than any of the other branches.