The Cabinet to the president is an very important part of US History, dating back to George Washington. Cabinet members help develop policies and provide guidance to the president.
To see an up today list of cabinet members, visit http://www.whitehouse.gov/administration/cabinet
The explanation of the cabinet is at the top of the above web page
“The tradition of the Cabinet dates back to the beginnings of the Presidency itself. Established in Article II, Section 2, of the Constitution, the Cabinet’s role is to advise the President on any subject he may require relating to the duties of each member’s respective office.
The Cabinet includes the Vice President and the heads of 15 executive departments — the Secretaries of Agriculture, Commerce, Defense, Education, Energy, Health and Human Services, Homeland Security, Housing and Urban Development, Interior, Labor, State, Transportation, Treasury, and Veterans Affairs, as well as the Attorney General.
 

The Cabinet

The tradition of the Cabinet dates back to the beginnings of the Presidency itself. Established in Article II, Section 2, of the Constitution, the Cabinet’s role is to advise the President on any subject he may require relating to the duties of each member’s respective office.
The Cabinet includes the Vice President and the heads of 15 executive departments — the Secretaries of Agriculture, Commerce, Defense, Education, Energy, Health and Human Services, Homeland Security, Housing and Urban Development, Interior, Labor, State, Transportation, Treasury, and Veterans Affairs, as well as the Attorney General.
http://upload.wikimedia.org/wikipedia/commons/f/fa/US_Cabinet_official_group_photo_July_26,_2012.jpg
President Barack Obama and Vice President Joe Biden pose with the full Cabinet for an official group photo in the Grand Foyer of the White House, July 26, 2012. (Official White House Photo by Chuck Kennedy)
In order of succession to the Presidency:
Vice President of the United States
Joseph R. Biden
Department of State
Secretary John Kerry
http://www.state.gov
Department of the Treasury
Secretary Jack Lew
http://www.treasury.gov
Department of Defense
Secretary Chuck Hagel
http://www.defense.gov
Department of Justice
Attorney General Eric H. Holder, Jr.
http://www.usdoj.gov
Department of the Interior
Secretary Sally Jewell
http://www.doi.gov
Department of Agriculture
Secretary Thomas J. Vilsack
http://www.usda.gov
Department of Commerce
Secretary Penny Pritzker
http://www.commerce.gov
Department of Labor
Secretary Thomas E. Perez
http://www.dol.gov
Department of Health and Human Services
Secretary Kathleen Sebelius
http://www.hhs.gov
Department of Housing and Urban Development
Secretary Shaun L.S. Donovan
http://www.hud.gov
Department of Transportation
Secretary Anthony Foxx
http://www.dot.gov
Department of Energy
Secretary Ernest Moniz
http://www.energy.gov
Department of Education
Secretary Arne Duncan
http://www.ed.gov
Department of Veterans Affairs
Secretary Eric K. Shinseki
http://www.va.gov
Department of Homeland Security
Acting Secretary Rand Beers
http://www.dhs.gov
The following positions have the status of Cabinet-rank:
White House Chief of Staff
Denis McDonough
Environmental Protection Agency
Administrator Gina McCarthy
http://www.epa.gov
Office of Management & Budget
Director Sylvia Burwell
whitehouse.gov/omb
United States Trade Representative
Ambassador Michael Froman
www.ustr.gov
United States Mission to the United Nations
Ambassador Samantha Power
usun.state.gov/
Council of Economic Advisers
Chairman Jason Furman
www.whitehouse.gov/administration/eop/cea/
Small Business Administration
Acting Administrator Jeanne Hulit
www.sba.gov/