Who are these people that killed thousands and thousands of civilians they had never met? Where do they come from? They are mostly young males but they have little else in common. Today's terrorists are as diverse as the nations from which they come. They can be highly educated, working class or at the bottom of the socio-economic scale. Their goals range from the narrow political desire of the Real IRA to drive Britain out of Ireland to the wide-ranging desire of al-Qaeda to halt the spread of western culture and promiscuity.