Who is the current president of the United States?

The current president of the United States is Barack Hussein Obama, serving his second four-year term in office, which expires when a new president is sworn in in January.  American presidents serve a four-year term, renewable once; currently several candidates are campaigning to replace him in 2017, the main party candidates being Hillary Clinton (Democrat) and Donald J. Trump (Republican).  The president is chief executive of the Executive branch of the government, responsible for executing the duties of various government agencies, and for representing the country in international matters like treaties and trade agreements (the other two branches are the legislative branch, which is responsible for making laws and determining how government funds are spent, and the judicial branch, responsible for interpreting these laws and adhering to the U.S. Constitution.) The president is also commander-in-chief of the Armed Forces.