What is "The Checks and Balances System"?

The system of checks and balances is a part of the Constitution. It guarantees that no part of the government becomes too powerful. For example, the legislative branch is in charge of making laws. The executive branch can veto the law, thus making it harder for the legislative branch to pass the law. The judicial branch may also say that the law is unconstitutional and thus make sure it is not a law.