How do computer viruses work?
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What is a computer virus?
Computer viruses are so-called because, like real viruses, they can self-replicate. Once your computer is infected with a virus, this is how it spreads. When a computer virus infects your computer, it may slow it down and stops it from working properly.
There are three main ways that your computer may have become infected with a computer virus.
The first way your computer could become infected from removable media, like a USB stick. If you insert a USB stick or disk into your computer from an unknown source, it may contain a virus.
Sometimes hackers leave infected USB sticks or disks in people’s workplaces, or public places like cafes to spread computer viruses. People sharing USBs may also transfer files from an infected computer to one that isn’t infected.
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Another way your computer becomes infected with a virus is through a download from the internet.
If you are downloading software or apps to your computer, ensure you do so from a trusted source.
Avoid downloading anything via a pop-up or a website you do not know.
The third way your computer could become infected with a virus is if you open an attachment, or click on a link, in a spam email.
Whenever you receive mail from a sender you do not know or trust, avoid opening it. If you do open it, do not open any attachments or click on any links.
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How to know a computer has a virus
