7. Other pests
Worms
These are a bit like a computer virus but they spread on their own through computer networks. Their biggest problem is the sheer amount of computer time and bandwidth they soak up, so making the network slow to a crawl.
Adware / Spyware
These are programs designed to keep track of which adverts you click on and then they send specific adverts to your browser. Fairly harmless but annoying and hard to get rid of.
Challenge see if you can find out one extra fact on this topic that we haven't already told you
Click on this link: Spyware