Lesson 3 – Keeping your computer safe

Learning Objectives

  • Understand what threats exist to your computer
  • Know how to protect your computer from these threats

Learning Outcomes

Could discuss and evaluate the different types of threat to a computer.  Complete the worksheet describing what each type of threat is and giving reasons.

Should discuss the different types of threat to a computer.  Complete the worksheet describing what each type of threat is.

Must discuss the different types of threat to a computer.  Complete most of the worksheet describing what each type of threat is.


Words to learn: malwarevirus, trojan, spyware, phishing, backup, bot net


Watch the above video which gives a quick 30 second introduction to what a virus is.



You need to find out about different types of Malware and virus.  In your books, write the heading “worms”, and use the following website (or more if you have time!!) to describe what a worm is (hint – what does “self-replicating” mean?)

Worms webpage


Now add the heading “Trojan”.  Remember the wooden horse of Troy?  Look here, and describe what a Trojan does to your computer (you may need to find out what “social engineering” is…:

Trojan webpage


Use this video to add a spyware definition to your book:


Add botnets to your book:- They are a very current threat!


Another threat is phishing – what can you find out about phishing online?

So, with all of these threats, how can we protect ourselves?  Well we could backup our valuable files.  There are lots of ways of doing this:

  • Using an optical backup disk such as DVD-RW or BD-RW
  • Using an external hard drive
  • Using a cloud backup service such as Google Drive, Microsoft OneDrive or DropBox

In your books, explain why a back-up might not be the best way to protect against a virus, based on what you’ve learned so far.

Of course,  you can (and should) use up to date anti-virus software.  Look at these links, and see which you would choose, and why…

Research and presentation:

Here you have the definitive report of internet security in 2017.  Use the contents pages to find five facts about the viruses/threats you have learned about during this lesson.  Present these on google slides or Microsoft powerpoint, and explain your findings to the rest of the class.


Fill in the answers on this worksheet.  You can use the Internet to help you find the answers if you are not sure.

There were several big virus attacks on organisations this year.  The main problem was that organisations had not updated their operating system and the virus writers took advantage of this weakness.  You all have operating systems on your smart phones.  Use the Internet to find out what a computer operating system does.