What is a Computer Virus?
A virus is a malicious program that replicates itself on your machine and around the internet. In by gone days, the programs would do anything from stopping programs running to deleting the contents of your hard disk. Today, although you still find viruses like those they are used more to collect information about you to be used in fraudulent activities. They can be used to collect credit card details or all your information to steal your identity also known as identity theft.
What is a Trojan?
A Trojan is a specific type of virus. The word Trojan comes from the story of the war between the Greeks and the Trojan army. The Trojan army could not breach the city walls of Troy so Odysseus of the Trojan city Ithaca had an idea to build a big wooden horse to hide soldiers inside. When night fell, the soldiers jumped out and killed the guards on the walls and opened the gates to allow the army a full attack of troy. The plan worked perfectly. This is essentially exactly what a Trojan virus is.
A Trojan is a small piece of software that sits on the client’s/users end and acts as a medium between the hacker and the computer he wishes to hack. It allows the computer to be opened up and attacked. It gives the hacker / virus writer complete control of your computer without you even knowing. They can perform task from as simple as opening up the CD drive to copying files and moving the mouse. Using this method they can collect as much information about you or do as much damage as they like.
What is AntiVirus?
Antivirus is a program that protects your computer from viruses. The program scans all the files that the operating system reads and determines whether they are safe or not. They also allow you to perform a full system scan of all the files even ones that have not been used for a while to determine whether or not your computer system is clean. It is essential to have antivirus installed on your computer. Do not install more than one piece of antivirus software on your computer as they can often conflict and cuase more issues.