When people have very strong opinions, these could become extreme.
People who have certain beliefs about politics or religions which are hateful, dangerous or against the law are often known as extremists. This harmful behaviour is called extremism.
Extremists might use violence and damage to express their views. And extremist racial or religious groups might use hate, fear or violence to control and influence people. You may have heard different groups mentioned, like Daesh, also known as ISIS or IS but there are other groups like Combat 18 who are also considered to be extremists.
Parents. carers. schools and all those working with children and young people have a legal duty to identify the signs of radicalisation and extremism and report these so support can be put in place.
Report worries about Terrorism
Welsh Government Counter Terrorism Advice