Terrorism is nothing but a political weapon which is used by the super powers to attack and defeat their enemies.
Terrorism is a concept which functions as a political weapon. Some governments, throughout the history, used to use such a weapon in different ways to attack and defeat their enemies and to rule over their people. In the past, since the most governments had religious appearance or affiliation, they labeled their opponents as "pagans" or "unbelievers". Now, liberal-democratic systems call their enemies terrorist, based on so-called modern liberal democratic values. Indeed, to attack their enemies they need to mark and to label them as terrorists. It is thought that Islam is the most important enemy of Capitalism and of its unjust values, as Communism already was. So, the US and its allies politically attack some countries particularly Iran using this term. They accuse Iran of supporting terrorism or committing terrorist attacks while the US is distinguished in creating and supporting terrorist groups like Taliban, Al-Qaeda and ISIS.