The 9/11 terrorist attacks refer to a series of coordinated suicide hijackings by the extremist group Al-Qaeda on September 11, 2001, in which commercial airplanes were used as weapons to target important landmarks in the United States, resulting in the loss of thousands of lives.
Related terms
War on Terror: This term refers to the U.S. government's response to the 9/11 attacks, including military action against terrorist organizations and efforts to increase national security.
Patriot Act: The Patriot Act is legislation passed after 9/11 that expanded surveillance powers and gave law enforcement agencies more tools to combat terrorism.
TSA (Transportation Security Administration): The TSA was created after 9/11 as an agency responsible for securing transportation systems within the United States, such as airports and airlines.