Question

What methods do terrorists employ?

Answer 1

One method,if my understanding is correct, is to attack by surpirse or to kill as many people as possible. 
By doing that, the killing of numerous/millions of people, usually end on on planes, buildings... That type of stuff. 
They usually do bombing of large areas.
~Hope this helped :)

Answer 2

Im not exactly sure but:
- fear of arms and ammunition they cArry with them
- theyre often masked which instigates fear of the unknown
- theyre possibly popular for terrorist activities