If you ask what the terrorism is! I would reply, it is a kind of blind crime which is done by a group who is far from social humanity in all.
Such an action which is like the temper of beasts, everyone who does it is a disgusted sabotage.
Don't call such a man a human! A man who enjoys doing such an action is one of the beasts who live with beasts in all.
While he buys a frightful environment by his criminality, no one sells him anything but debauchery goods in life.