Proactive cyber defence is like having protective armor or shields around you to help protect you from bad people online. It is like having a big, strong security guard watching over you so that no one can get close to you and break into your computer or do any other bad things on the internet. The security guard helps to identify any suspicious activity on your computer, like someone trying to get into your files or emails. It also helps to block malicious websites and software that could hurt your computer or steal your information. Proactive cyber defence can also help you to manage passwords so they are safe and private.