The 44th President of the United States is Barack Obama, who served from January 20, 2009, to January 20, 2017. He was the first African American to hold the office and was a member of the Democratic Party. Before his presidency, he was a U.S. Senator from Illinois. During his time in office, Obama implemented significant policies, including the Affordable Care Act, aimed at expanding healthcare access. He also focused on economic recovery following the 2008 financial crisis and emphasized climate change initiatives, including the Paris Agreement. His presidency is noted for its historic milestones and challenges.