CTU, or Counter Terrorist Unit, is a fictional law enforcement agency featured in the television series 24. The unit specializes in preventing and responding to terrorist threats, often working under intense time constraints. The show follows the character Jack Bauer, a counter-terrorism agent, as he navigates complex situations to protect national security. In the series, CTU employs various tactics, including intelligence gathering and tactical operations, to thwart terrorist plots. The agency is depicted as having advanced technology and a dedicated team, highlighting the challenges and moral dilemmas faced in the fight against terrorism.