the U.S. Federal Government is made up of three branches: legislative, executive and judicial.
The Legislative Branch is made up of the House and Senate, known collectively as the Congress. Among other powers, the legislative branch makes all laws, declares war, regulates interstate and foreign commerce and controls taxing and spending policies
The Executive Branch consists of the President, his or her advisors and various departments and agencies. This branch is responsible for enforcing the laws of the land.
The Judicial Branch consists of the U.S. Supreme Court and the Federal Judicial Center.
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Source: Mike Wirth & Dr. Suzanne Cooper Guasco, How Our Laws Are Made http://www.mikewirthart.com/wp-content/uploads/2010/06/howlawsmadeWIRTH2.jpg