The concept of terrorism has been used for a long time, and relates to different forms and types of activities and groups that have carried out actions considered to be terrorist, such as hijacking aircraft, taking hostages, and staging armed attacks on certain areas. However, different definitions of terrorism exist, firstly at the regional and international levels, and secondly on lists that categorize terrorist groups.Although several networks of groups are categorized as terrorist, the mode that has preoccupied the world and most Arab and western countries is represented by the networks of al-Qaeda and so-called �Islamic State�. The latter represents the new generation of �Islamic terrorist� and is widespread to an extent that has allowed it to establish an emirate in Iraq and Syria, and satellite emirates in more than one spot around the world. Moreover, its cells have been able to carry out attacks against several targets in Europe, Australia, Africa, and Asia. The group has come to represent a basic threat to many countries at local, regional and international levels. Hence various approaches and strategies to confront it are being employed, and that is what this publication will discuss.