There are many terrorist groups, some have done more devastation than others. These groups were composed for destruction and mayhem. Terrorist groups can range from small groups to large groups in the thousands. These groups of terrorist can range from small scale attacks to global threats.
ISIS is a very well known terrorist group in modern day. There attacks have been focused on Europe mostly, but have also attacked the United states and Australia. Most of these attacks are concentrated on a certain person or location that would have the greatest impact on a community. ISIS has killed more than 1,200 people outside of Syria. ISIS is thought to have up to or even more than 80,000 members.
Al-Qaeda is the best known terrorist group. They have had the greatest impact of any terrorist group and have affected the most countries in the world. Al-Qaeda's most devastating attack was on American soil when a plane struck the twin towers. The group was founded by Osama bin Laden and the objective of the group was to unify Muslims through jihad . They killed thousands of innocent people.
The Taliban is a well known terrorist group in the middle East . This group was founded by Mullah Mohammed Omar in the mid 90's. The Taliban is known for human trafficking as well as drug trafficking. They believe in jihad and kill in his name. This group has killed thousands of innocent people as a believe in there god.