The Transportation Security Administration (TSA) is a U.S. government agency responsible for ensuring the safety and security of travelers in airports and on commercial flights. Established in response to the events of September 11, 2001, the TSA implements security measures, including passenger screening and baggage checks, to prevent threats to aviation. TSA officers use various tools and technologies, such as metal detectors and X-ray machines, to identify prohibited items. The agency also provides guidelines for travelers, including restrictions on liquids and carry-on items, to help maintain a secure travel environment while facilitating the movement of people and goods.