What are causes and effects of terrorism...

Terrorism is, in the broadest sense, the use of intentionally indiscriminate violence as a means to create terror, or fear, to achieve a political, religious or ideological aim. It is used in this regard primarily to refer to violence against peacetime targets or in war against non-combatants. The terms "terrorist" and "terrorism" originated during the French Revolution of the late 18th century but gained mainstream popularity during the U.S. Presidency of Ronald Reagan (1981–89) after the 1983 Beirut barracks bombings and again after the attacks on New York City and Washington, D.C. in September 2001 and on Bali in October 2002.

There is no commonly accepted definition of "terrorism".Being a charged term, with the connotation of something "morally wrong", it is often used, both by governments and non-state groups, to abuse or denounce opposing groups.Broad categories of political organisations have been claimed to have been involved in terrorism to further their objectives, including right-wing and left-wing political organisations, nationalist groups, religious groups, revolutionaries and ruling governments.Terrorism-related legislation has been adopted in various states, regarding "terrorism" as a crime.There is no universal agreement as to whether or not "terrorism", in some definition, should be regarded as a war crime.

According to the Global Terrorism Database by the University of Maryland, College Park, more than 61,000 incidents of non-state terrorism, resulting in at least 140,000 deaths, have been recorded from 2000 to 2014.