Cyberbullying is any bullying behaviour by electronic means. It typically includes intentionally causing someone or a group of people harm by sharing/posting unkind or offensive comments, sharing private information to shame or ridicule, impersonating others and promoting rumours or fake news about others. 

For younger people the perpetrators are usually people that they know (e.g. from school or the community) and quite often it is a continuation of bullying behaviour that is happening during the school day.