The Internet is of major importance to the global jihadist movement today. It facilitates ideological cohesion and network-building within a geographically scattered movement, and all levels of the jihadist network are present on the Internet. The jihadist websites differ enormously in nature and are run relatively independently of each other. However, many sites are inter-related in the sense that they frequently redistribute and circulate the same material. This indicates that despite a large number of sites, the scope of new material that appears on these sites every day is not necessarily very large. Concerning the functions of the jihadist Internet, it fulfils different objectives, most importantly of communicative character. The much feared cyber terrorism, i.e. destructive attack on information systems, does not, so far, seem to be a main objective for the jihadist use of the Internet.