From a Former Jihadist

Jihad, or what we define as Terrorism, comes in three forms – Jihad by the pen, Jihad by the sword and Jihad by finance. When one is not in a position of military strength he uses the pen, or propaganda. If one has military strength, he uses violence, including acts of terror. Jihad by finance comes in the form of money to fund both the propaganda and the terror.  (Source)