A firewall is a security system that monitors and controls incoming and outgoing network traffic.
In simple terms, it acts as a barrier between your device or network and the internet, helping to block harmful or unauthorised access while allowing safe connections through.
For example, a firewall can prevent hackers or malicious software from accessing your computer or personal data. When you connect to the internet: the firewall checks what is trying to enter or leave your device and blocks anything that seems unsafe.