A firewall is an online security measure to protect your computer from viruses and other malicious attacks.
You can use the internet to communicate with around 4.9 billion people worldwide.
The downside is that everybody also has access to you. This includes hackers and viruses that want to steal your data, take control of your computer or even destroy it.
To stop this from happening, a firewall controls the data flowing between your computer and the internet. A firewall inspects data to make sure it has the right permissions. If it does, it can pass through.
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When a firewall checks if data can enter your network, it'll read a message that comes with it called metadata. This will list a string of numbers indicating where the data has come from (known as the source address), where it's going (the 'destination address' aka your PC) and over which port.
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