The purpose of the executive branch is to enforce the laws that was set by the legislative branch and rulings set by the judicial branch. They enforce rules such as the prohibition of marijuana and the creation of bridges. The way they take care of things like that is through the multiple agencies that are in the administration. The way that this works is that after congress passes a bill they send it to the President to be signed. Once the bill is signed then the president must contact the head of the respective department to execute whatever law was passed. Once the head of the department is contacted and informed on what needs to be done they must contact the people and send an order for them to execute the law that was passed. The positions the presidential cabinet are the Vice President, Secretary of State, Secretary of Treasury, Secretary of Defense, Attorney General, Secretary of the Interior, Secretary of Agriculture, Secretary of Commerce, Secretary of Labor, Secretary of Health and Human Services, Secretary of Housing and Human Development, Secretary of Transportation, Secretary of Energy, Secretary of Education, Secretary of Veteran Affairs, and Secretary of Homeland Security. Many of these different departments will work together to achieve their goals. For example the Secretary of Defense and the Secretary of Homeland Security will work together to prevent terrorism. The Department of Homeland Security will gather intel and protect individuals that are within the country. While the Department of Defense will prevent terrorism outside of the country. For example The Department of Defense will send intel to the Department of Homeland Security to make sure that there are no home grown terrorist. This is shown during the threat of Al Qaeda, the Department of Defense would be sending troops to the Middle East to stop the terrorism there but they also got into America. When this happened the Department of Homeland Security would use the information and resources of the Department of Defense to prevent the spread of terrorism in America. One very important position in the cabinet is the Vice President. HIs job is to be the communicator between Congress and the president. So when the President wants to have legislation pushed through the Vice President will talk to Congress on what the President will pass. Then Congress will have a counteroffer to what the president wants. For example when Obama was trying to pass his healthcare policy they had to go back and forth about how many people the bill would cover and how much it would cost the Vice President was the person who was talking to Congress to tell them what they wanted. So basically, the Vice President is the messenger of the President and Congress. The role the the Berracurracy plays is that they execute the things that the president needs to take care of. For example the Central Intelligence Agency collects information for the other departments so they can take care of threats to the nation. They keep tabs on known terrorists as well as keep track of potential threats to the nation. Advisors are there to help the President make decisions on where to send people and how to handle situations that he has to deal with. They are there  for the president to talk to and to help him gather any information that he needs in order to make decisions on how to deal with problems.