Financing terrorism refers to a specific activity with many particular features. The financial resources it drowns are represented by both voluntary sympathizers' contributions and illegal revenues, generated by important criminal activities. Within the terrorist organization though, financial contributions of Diaspora and donations made by political and religious ideology sympathizers hold the most important role. Terrorists use similar techniques as money laundering to avoid the authorities' unwanted attention from and to protect the identities of those who lead the terrorist activities and also the people who benefit from the organization's funding.