Bill O'Reilly is an American television host and political commentator best known for his show 'The O'Reilly Factor' on Fox News. He has authored several books, many of which have become bestsellers. O'Reilly's style is known for his provocative and confrontational approach, making him a polarizing figure in American media. He has been involved in several controversies throughout his career, but remains a prominent voice in the conservative political landscape.