The deliberate commission of an act of violence to create an emotional response through the suffering of the victims in the furtherance of a political or social agenda.
Violence against civilians to achieve military or political objectives.
A psychological strategy of war for gaining political or religious ends by deliberately creating a climate of fear among the population of a state.
Above are definations of terrorism.

Olive dear, there is nothing called moderate muslims or Extreme muslims. Islam is religion of peace.Now the media with too many 24 hours channels, printable millions news paper & magaazine, do not show or print the so called moderate voice. They need sensational news to make money, so you will never see headlines with moderate voice. The groups are using religion for terror and western forces are using names of such groups to acheive the goals of war & financial machinery.A news reporter recently asked DalaiLama when the world will have peace, his reply "when world will have no human beings". The man is at war to show his supermacy on weak. Some countries have lot of money to supply to conflict areas to keep war going. Sister fatima explaination is good , but we muslims are fed up about people using certain verses of Quaran being qouted out of contest to prove the holy book teaches voilence. Yes if muslims are persecuted, yes we have to challange like others are doing after 9/11, attacking &killing innocents on what is term as war on terror. Does any any other book teaches to do that. Voilence will bring no peace. Some donot learn lessons from the past.