This chapter explores the meaning and causes of 'terrorism', 'radicalisation' and 'extremism'. It discusses the British government's policies and strategies to counter the attack on the 'British values'. The chapter examines the role of school staff and the larger community in preventing radicalisation and extremism. Recent examples of terrorism and extremism fuelled by religious convictions include Al-Qaeda which masterminded the attacks on the World Trade Centre in America in 2001; Al Shabab in Somalia; and Daesh with Islamic law. According to the Home Office, charismatic leaders with persuasive narratives such as Abu Hamza Al-Masri and Adolf Hitler play a vital role in radicalising and recruiting violent extremists. There are several pull factors that need to be accounted for such as community cohesion and a platform to debate different viewpoints if we are to counter terrorism and radicalisation. In the UK, radicalised young people are referred to the government's counter-radicalisation scheme.