Terrorist groups are organizations that use violence and intimidation to achieve political, ideological, or religious goals. They often target civilians to create fear and draw attention to their causes. These groups can vary in size, structure, and methods, and may operate locally or globally. Many terrorist groups are motivated by specific beliefs or grievances, such as nationalism, religion, or political ideology. Some well-known examples include Al-Qaeda, ISIS, and Boko Haram. Governments and international organizations work to combat terrorism through various strategies, including military action, intelligence sharing, and community engagement.