Terrorism is an unlawful act of violence that intimidates governments or societies to achieve political, religious, or ideological goals. It is caused by factors like social and political injustice, the belief that violence is effective, religious beliefs, illiteracy, and injustice. The impacts of terrorism include economic losses from damage and increased security spending, social impacts like fear and suspicion, and complicated international politics. Terrorist groups are often organized into cells and use tactics like bombings, shootings, and kidnappings to spread fear while avoiding detection. Some of the deadliest terrorist organizations globally are ISIS, Boko Haram, Lashkar-e-Taiba, and Al-Qaeda. Major terrorist attacks include 9/11,