>EXTENSION: The code at the end of a filename that indicates the file format.
>FIREWALL: Software or hardware that prevents unauthorised access to a computer overa network.
>HACKERS: People who break into other people's computers, often in an attempt to steal sensitive information.
>HOMEPAGE: A favourite page opened when you click a web browser's home button.
>MAC ADDRESS: Media Access Control. A unique code that identifies the network adapter in a PC.
>MALWARE: Software designed to perform harmful acts.
>PHISHING: Internet fraud that tries to trick you into revealing your details.
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