Frontline is an investigative documentary program distributed by the Public Broadcasting Service (PBS) in the United States. Episodes are produced at WGBH in Boston, Massachusetts. The series has covered a variety of domestic and international issues, including terrorism, elections, environmental disasters, and other sociopolitical issues. Since its debut in 1983, Frontline has aired in the United States for 42 seasons and has won critical acclaim and awards in broadcast journalism. Frontline has produced over 800 documentaries from both in-house and independent filmmakers, 200 of which are available online.